Read and download free pdf of CBSE Class 12 Physics Dual Nature of Radiation 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
Question. The photoelectric work function for a metal surface is 4.125 eV. The cut-off wavelength for this surface is
(a) 4125 Å
(b) 3000 Å
(c) 6000 Å
(d) 2062 Å
Answer: B
Question. The energy of a photon of green light of wavelength 5000Å is
(a) 3.459 × 10–19 joule
(b) 3.973 × 10–19 joule
(c) 4.132 × 10–19 joule
(d) 8453 × 10–19 joule
Answer: B
Question. The photoelectric threshold of Tungsten is 2300Å. The energy of the electrons ejected from the surface by ultraviolet light of wavelength 1800Å is
(a) 0.15 eV
(b) 1.5 eV
(c) 15 eV
(d) 150 eV
Answer: A
Question. Which of the following when falls on a metal will emit photoelectrons ?
(a) UV radiations
(b) Infrared radiation
(c ) Radio waves
(d) Microwaves
Answer: A
Question. A light having wavelength 300 nm fall on a metal surface.
The work function of metal is 2.54 eV, what is stopping potential ?
(a) 2.3 V
(b) 2.59 V
(c) 1.59 V
(d) 1.29 V
Answer: C
Question. A and B are two metals with threshold frequencies 1.8 × 1014 Hz and 2.2 × 1014 Hz. Two identical photons of energy 0.825 eV each are incident on them. Then photoelectrons are emitted in (Take h = 6.6 × 10–34 Js)
(a) B alone
(b) A alone
(c) neither A nor B
(d) both A and B.
Answer: B
Question. The photoelectric threshold wavelength of silver is 3250 × 10–10m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 × 10–10 m is (Given h = 4.14 × 10–15 eVs and c = 3 × 108 ms–1)
(a) ≈ 0.6 × 106 ms–1
(b) ≈ 61 × 103 ms–1
(c) ≈ 0.3 × 106 ms–1
(d) ≈ 6 × 105 ms–1
Answer: A,D
Question. An ionisation chamber, with parallel conducting plates as anode and cathodes has singly charged positive ions per cm3. The electrons are moving toward the anode with velocity 0.4 m/s. The current density from anode to cathode is X104 m A/m2. The velocity of positive ions moving towards cathode is
(a) 0.1 m/s
(b) 0.4 m/s
(c) zero
(d) 1.6 m/s
Answer: A
Question. The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of 5000 Å. Its work function is
(a) 4 × 10–19 J
(b) 1 J
(c) 2 × 10–19 J
(d) 3 × 10–19 J
Answer: A
Question. A particle is dropped from a height H. The de-Broglie wavelength of the particle as a function of height is proportional to
(a) H
(b) H1/2
(c) H0
(d) H–1/2
Answer: D
Question. Hard X-rays for the study of fractures in bones should have a minimum wavelength of 10–11 m. The accelerating voltage for electrons in X-ray machine should be
(a) < 124 kV
(b) > 124 kV
(c) between 60 kV and 70 kV
(d) = 100 kV
Answer: A
Question. A parallel beam of light is incident normally on a plane surface absorbing 40% of the light and reflecting the rest. If the incident beam carries 60 watt of power, the force exerted by it on the surface is
(a) 3.2 × 10–8 N
(b) 3.2 × 10–7 N
(c) 5.12 × 10–7 N
(d) 5.12 × 10–8 N
Answer: B
Question. Radiations of two photon’s energy, twice and ten times the work function of metal are incident on the metal surface successsively. The ratio of maximum velocities of photoelectrons emitted in two cases is
(a) 1 : 2
(b) 1 : 3
(c) 1 : 4
(d) 1 : 1
Answer: B
Question. The momentum of a photon of wavelength λ is
(a) hλ
(b) h/λ
(c) λ/h
(d) h/cλ
Answer: B
Question. A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed 2 m away, the number of electrons emitted by photocathode are reduced by a factor of
(a) 1/8
(b) 1/16
(c) 1/2
(d) 1/4
Answer: D
Question. The wavelength of Kα-line characteristic X-rays emitted by an element is 0.32 Å. The wavelength of Kβ-line emitted by the same element will be
(a) 0.32 Å
(b) 0.39 Å
(c) 0.49 Å
(d) 0.27 Å
Answer: D
Question. Which metal will be suitable for a photoelectric cell using light of wavelength 4000Å. The work functions of sodium and copper are respectively 2.0 eV and 4.0 eV.
(a) Sodium
(b) Copper
(c) Both
(d) None of these
Answer: A
Question. Which one of the following graphs represents the variation of maximum kinetic energy (EK) of the emitted electrons with frequency u in photoelectric effect correctly ?
Answer: D
Question. The X-rays of wavelength 0.5 Å are scattered by a target.
What will be the energy of incident X-rays, if these are scattered at an angle of 72º ?
(a) 12.41 keV
(b) 6.2 keV
(c) 18.6 keV
(d) 24.82 keV
Answer: D
Question. In which of the following, emission of electrons does not take place?
(a) Thermionic emission
(b) X-rays emission
(c) Photoelectric emission
(d) Secondary emission
Answer: B
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CBSE Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Worksheet
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Worksheet for Physics CBSE Class 12 Chapter 11 Dual Nature of Radiation and Matter
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Chapter 11 Dual Nature of Radiation and Matter CBSE Class 12 Physics Worksheet
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Worksheet for CBSE Physics Class 12 Chapter 11 Dual Nature of Radiation and Matter
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