CBSE Class 12 Physics Dual Nature of Radiation and Matter Worksheet Set A

Read and download free pdf of CBSE Class 12 Physics Dual Nature of Radiation and Matter Worksheet Set A. Download printable Physics Class 12 Worksheets in pdf format, CBSE Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Physics Class 12 Assignments and practice them daily to get better marks in tests and exams for Class 12. Free chapter wise worksheets with answers have been designed by Class 12 teachers as per latest examination pattern

Chapter 11 Dual Nature of Radiation and Matter Physics Worksheet for Class 12

Class 12 Physics students should refer to the following printable worksheet in Pdf in Class 12. This test paper with questions and solutions for Class 12 Physics will be very useful for tests and exams and help you to score better marks

Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Worksheet Pdf

CBSE Class 12 Physics Dual Nature of Radiation and Matter Worksheet Set A

Question. The de-Broglie wavelength of a neutron at 927°C is λ. What will be its wavelength at 27 °C ?
(a) λ/2
(b) λ
(c) 2 λ
(d) 4 λ

Answer: C

Question. Ultraviolet radiation of 6.2 eV falls on an aluminium surface (workfunction 4.2 eV). The kinetic energy in joule of the faster electron emitted is approximately
(a) 3 × 10–21
(b) 3 × 10–19
(c) 3 × 10–17
(d) 3 × 10–15

Answer: B

Question. A material particle with a rest mass m0 is moving with speed of light c. The de-Broglie wavelength associated is given by
(a) h/m0c
(b) m0c/h
(c) zero
(d) ∞

Answer: C

Question. For a given photosensitive material and frequency (> threshold frequency) of incident radiation, the photoelectric current varies with the intensity of incident light as 
cbse-class-12-physics-dual-nature-of-radiation-and-matter-worksheet-set-a

Answer: A

Question. An X-ray tube is operated at 15 kV. Calculate the upper limit of the speed of the electrons striking the target.
(a) 7.26 × 107 m/s
(b) 7.62 × 107 m/s
(c) 7.62 × 107 cm/s
(d) 7.26 × 109 m/s

Answer: A

Question. Which of the following figures represents the variation of particle momentum and the associated de-Broglie wavelength?
cbse-class-12-physics-dual-nature-of-radiation-and-matter-worksheet-set-a

Answer: A

Question. The de-Broglie wavelength of an electron moving in the nth Bohr orbit of radius r is given by
(a) 2πr/n
(b) nπr
(c) nr/2π
(d) nr/π

Answer: A

Question. A photon of 1.7 × 10–13 joule is absorbed by a material under special circumstances. The correct statement is
(a) Electrons of the atom of absorbed material will go the higher energy states
(b) Electron and positron pair will be created
(c) Only positron will be produced
(d) Photoelectric effect will occur and electron will be produced

Answer: B

Question. In a photoelectric effect measurement, the stopping potential for a given metal is found to be V0 volt when radiation of wavelength l0 is used. If radiation of wavelength 2 λ0 is used with the same metal then the stopping potential (in volt) will be
(a) V0/2
(b) 2 V0
(c) V0 + hc/2eλ0
(d) V0 - hc/2eλ0

Answer: D

Question. If the energy of a photon is 10 eV, then its momentum is
(a) 5.33 × 10–23 kg m/s
(b) 5.33 × 10–25 kg m/s
(c) 5.33 × 10–29 kg m/s
(d) 5.33 × 10–27 kg m/s

Answer: D

Question. When X-rays of wavelength 0.5 Å would be transmitted by an aluminium tube of thickness 7 mm, its intensity remains one-fourth. The attenuation coefficient of aluminium for these X-rays is
(a) 0.188 mm–1
(b) 0.189 mm–1
(c) 0.198 mm–1
(d) None of these

Answer: C

Question. The work function of aluminium is 4.2 eV. If two photons, each of energy 3.5 eV strike an electron of aluminium, then emission of electrons
(a) will be possible
(b) will not be possible
(c) Data is incomplete
(d) Depends upon the density of the surface

Answer: B

Question. For intensity I of a light of wavelenght 5000Å the photoelectron saturation current is 0.40 μA and stopping potential is 1.36 V, the work function of metal is
(a) 2.47 eV
(b) 1.36 eV
(c) 1.10 eV
(d) 0.43 eV

Answer: C

Question. A source S1 is producing, 1015 photons per second of wavelength 5000 Å. Another source S2 is producing 1.02×1015 photons per second of wavelength 5100Å Then, (power of S2) to the (power of S1) is equal to :
(a) 1.00
(b) 1.02
(c) 1.04
(d) 0.98

Answer: A

Question. The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be
(a) 2.4 V
(b) – 1.2 V
(c) – 2.4 V
(d) 1.2 V

Answer: D

Question. Photoelectric emmision occurs only when the incident light has more than a certain minimum
(a) power
(b) wavelength
(c) intensity
(d) frequency

Answer: D

Question. The kinetic energy of electron (in electron volt) moving with a velocity of 4 × 106 m/s will be
(a) 60 eV
(b) 50 eV
(c) 30 eV
(d) 45.5 eV

Answer: D

Question. If the momentum of electron is changed by P, then the de Broglie wavelength associated with it changes by 0.5%.
The initial momentum of electron will be
(a) 200 P
(b) 400 P
(c) P/200
(d) 100 P

Answer: A

Question. Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is
(a) 1 : 4
(b) 1 : 2
(c) 1 : 1
(d) 1 : 5

Answer: B

Question. An electron (mass m) with an initial velocity v = v0 î is in an electric field E = -E0 ĵ . If λ0 = h /mv, it's de-Broglie wavelnegth at time t is given by
cbse-class-12-physics-dual-nature-of-radiation-and-matter-worksheet-set-a

Answer: C 

ONE MARK QUESTIONS:

Question. The graph shows variation of stopping potential V0 versus frequency of incident radiation ν for two photosensitive metals A and B. Which of the two metals has higher threshold frequency and why?
Answer :

 CBSE Class 12 Physics Dual Nature of Radiation and Matter Worksheet Set A_1

Question. Name the phenomenon which shows the quantum nature of electromagnetic radiation.
Answer : Photoelectric effect shows the quantum nature of electromagnetic radiation.

Question. Which experiment establishes the wave nature of the particle?
Answer : The wave nature of the particle is established by Davisson- Germer Experiment.

Question. Which optical phenomenon is exhibited by the particle in famous Davisson – Germer Experiment?
Answer : Diffraction of light.
 

THREE MARKS QUESTIONS

Question. Light of intensity'I' and frequency ‘V’ is incident on a photosensitive surface and causes photoelectric emission. What will be the effect on photo current when
(i) the intensity of light is gradually increased,
(ii) the frequency of incident radiation is increased, and
(iii) the anode potential is increased?
In each case, all other factors remain the same. Explain, giving justification in each case.
Answer :  (i) As we increase the intensity of radiation the number of photons increases. And we know that each photon will impart energy to each electron hence the number of electron increases so that the photo-current.
ii) On increasing the frequency above threshold frequency, only the energy of the photons increases not their numbers. Hence the photo- current will remain almost constant.
(iii) With an increase in the accelerating potential, the photoelectric current increases first, reaches maximum when all the electrons gets collected at the positive potential plate and then remains constant. The maximum value of the anode current is called saturation current.

Question. State two important properties of photon which are used to write Einstein’s photoelectric equation.
Define (i) stopping potential and (ii) threshold frequency, using Einstein’s equation and drawing necessary plot between relevant quantities.
Answer : The properties of photon used to write Einstein’s photoelectric equation are 
(i) The rest mass of the photon is zero.
(ii) The energy of the photon is E = hν.
Stopping potential: For a particular frequency of incident radiation, the minimum negative (retarding) potential V0 for which the photocurrent stops or becomes zero is called the cut-off or stopping potential.
Threshold frequency: The minimum frequency required for photoelectrons to be emitted from a metal surface is called the threshold frequency.
The graph between stopping potential and frequency of incident radiation is shown below: (Image 6)
 

Question. Using photon picture of light, show how Einstein’s photoelectric equation can be established. Write two features of photoelectric effect which cannot be explained by wave theory.
Answer :

CBSE Class 12 Physics Dual Nature of Radiation and Matter Worksheet Set A_2

Question. Draw graphs showing variation of photoelectric current with applied voltage for two incident radiations of equal frequency and different intensities. Mark the graph for the radiation of higher intensity.
Answer :

CBSE Class 12 Physics Dual Nature of Radiation and Matter Worksheet Set A_3

              Very Short Answer

Q1)       Who found the charge on an oil droplet?

Q2)       What is work function of the metal?

Q3)       Who discovered the X-rays?

Q4)       Where we will use the unit of energy?

Q5)       Who discovered the cathode rays?

             

              Short Answer

Q6)       What do you understand by the Einstein’s photoelectric equation?

Q7)       Define electron emission?

Q8)       What do you understand by the Hertz’s observation?

Q9)       What is the Davisson and Germer experiment?

Q10)     What do you mean by the Hallwachs’ and Lenard’s observation?

             

              Long Answer

Q11)     What are the points we have to take care for the photon picture of the electromagnetic radiation?

Q12)     State the difference between electromagnetic wave and matter wave?

Q13)     Write short note on photocell?

Q14)     State the difference between photoelectric effect and photovoltaic effect?

Q15)     What kind of experimental features of observations we have to take care for photoelectric effect?

Please click on below link to download CBSE Class 12 Physics Dual Nature of Radiation and Matter Worksheet Set A

More Study Material

CBSE Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Worksheet

The above practice worksheet for Chapter 11 Dual Nature of Radiation and Matter has been designed as per the current syllabus for Class 12 Physics released by CBSE. Students studying in Class 12 can easily download in Pdf format and practice the questions and answers given in the above practice worksheet for Class 12 Physics on a daily basis. All the latest practice worksheets with solutions have been developed for Physics by referring to the most important and regularly asked topics that the students should learn and practice to get better scores in their examinations. Studiestoday is the best portal for Printable Worksheets for Class 12 Physics students to get all the latest study material free of cost.

Worksheet for Physics CBSE Class 12 Chapter 11 Dual Nature of Radiation and Matter

Teachers of studiestoday have referred to the NCERT book for Class 12 Physics to develop the Physics Class 12 worksheet. If you download the practice worksheet for the above chapter daily, you will get better scores in Class 12 exams this year as you will have stronger concepts. Daily questions practice of Physics printable worksheet and its study material will help students to have a stronger understanding of all concepts and also make them experts on all scoring topics. You can easily download and save all revision Worksheets for Class 12 Physics also from www.studiestoday.com without paying anything in Pdf format. After solving the questions given in the practice sheet which have been developed as per the latest course books also refer to the NCERT solutions for Class 12 Physics designed by our teachers

Chapter 11 Dual Nature of Radiation and Matter worksheet Physics CBSE Class 12

All practice paper sheet given above for Class 12 Physics have been made as per the latest syllabus and books issued for the current academic year. The students of Class 12 can be assured that the answers have been also provided by our teachers for all test paper of Physics so that you are able to solve the problems and then compare your answers with the solutions provided by us. We have also provided a lot of MCQ questions for Class 12 Physics in the worksheet so that you can solve questions relating to all topics given in each chapter. All study material for Class 12 Physics students have been given on studiestoday.

Chapter 11 Dual Nature of Radiation and Matter CBSE Class 12 Physics Worksheet

Regular printable worksheet practice helps to gain more practice in solving questions to obtain a more comprehensive understanding of Chapter 11 Dual Nature of Radiation and Matter concepts. Practice worksheets play an important role in developing an understanding of Chapter 11 Dual Nature of Radiation and Matter in CBSE Class 12. Students can download and save or print all the printable worksheets, assignments, and practice sheets of the above chapter in Class 12 Physics in Pdf format from studiestoday. You can print or read them online on your computer or mobile or any other device. After solving these you should also refer to Class 12 Physics MCQ Test for the same chapter.

Worksheet for CBSE Physics Class 12 Chapter 11 Dual Nature of Radiation and Matter

CBSE Class 12 Physics best textbooks have been used for writing the problems given in the above worksheet. If you have tests coming up then you should revise all concepts relating to Chapter 11 Dual Nature of Radiation and Matter and then take out a print of the above practice sheet and attempt all problems. We have also provided a lot of other Worksheets for Class 12 Physics which you can use to further make yourself better in Physics

Where can I download latest CBSE Practice worksheets for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter

You can download the CBSE Practice worksheets for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter for the latest session from StudiesToday.com

Can I download the Practice worksheets of Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter in Pdf

Yes, you can click on the links above and download chapter-wise Practice worksheets in PDFs for Class 12 for Physics Chapter 11 Dual Nature of Radiation and Matter

Are the Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Practice worksheets available for the latest session

Yes, the Practice worksheets issued for Chapter 11 Dual Nature of Radiation and Matter Class 12 Physics have been made available here for the latest academic session

How can I download the Chapter 11 Dual Nature of Radiation and Matter Class 12 Physics Practice worksheets

You can easily access the links above and download the Class 12 Practice worksheets Physics for Chapter 11 Dual Nature of Radiation and Matter

Is there any charge for the Practice worksheets for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter

There is no charge for the Practice worksheets for Class 12 CBSE Physics Chapter 11 Dual Nature of Radiation and Matter you can download everything free

How can I improve my scores by solving questions given in Practice worksheets in Chapter 11 Dual Nature of Radiation and Matter Class 12 Physics

Regular revision of practice worksheets given on studiestoday for Class 12 subject Physics Chapter 11 Dual Nature of Radiation and Matter can help you to score better marks in exams

Are there any websites that offer free Practice test papers for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter

Yes, studiestoday.com provides all the latest Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter test practice sheets with answers based on the latest books for the current academic session

Can test sheet papers for Chapter 11 Dual Nature of Radiation and Matter Class 12 Physics be accessed on mobile devices

Yes, studiestoday provides worksheets in Pdf for Chapter 11 Dual Nature of Radiation and Matter Class 12 Physics in mobile-friendly format and can be accessed on smartphones and tablets.

Are practice worksheets for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter available in multiple languages

Yes, practice worksheets for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter are available in multiple languages, including English, Hindi