JEE Physics Online Test Dual Nature Of Radiation And Matter Set E

1. A proton is accelerated through 225 V. Its de-Broglie wavelength is

2. de-Broglie wavelength associated with an electron revolving in the nth state of hydrogen atom is directly proportional to

3. Dynamic mass of the photon in usual notations is given by

4. An electron and a proton have same kinetic energy. Ratio of their respective de-Broglie wavelength is about

5. If the energy of a photon is 10 eV, then its momentum is

6. A metal surface is illuminated by the photons of energy 5 eV and 2.5 eV respectively. The ratio of their wavelengths is

7. When ultraviolet rays fall on a metal plate then photoelectric effect does not occur, it occurs by

8. If particles are moving with same velocity, then which has maximum de-Broglie wavelength?

9.

10. If we consider electrons and photons of same wavelength, then they will have same

11. An electron of mass m, when accelerated through a potential difference V, has de-Broglie wavelength X. The de-Broglie wavelength associated with a proton of mass M accelerated through the same potential difference, will be

12. A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 x 10⁶ ms^-1. The velocity of the particle is (mass of electron = 9.1 ÌÑ 10^-31 kg)

13. Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV then the de-Broglie wavelength associated with the electrons would

14. If the momentum of an electron is changed by P, then the de-Broglie wavelength associated with it changes by 0.5%. The initial momentum of electron will be

15.

16. The work function of tungsten is 4.50 eV. The wavelength of fastest electron emitted when light whose photon energy is 5.50 eV falls on tungsten surface, is

17. In photoelectric effect, if a weak intensity radiation instead of strong intensity of suitable frequency is used then

18. The photo-electrons emitted from a surface of sodium metal are such that they

19. Find the number of electrons emitted per second by a 24 W source of monochromatic light of wavelength 6600Å, assuming 3% efficiency for photoelectric effect (take h = 6.6 x 10^-34 Js)

20. If in a photoelectric cell, the wavelength of incident light is changed from 4000 Å to 3000 Å then change in stopping potential will be

21. Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the material is

22. When monochromatic radiation of intensity I falls on a metal surface, the number of photoelectron and their maximum kinetic energy are N and T respectively. If the intensity of radiation is 2I, the number of emitted electrons and their maximum kinetic energy are respectively

23. 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

24.

25. A 5 watt source emits monochromatic light of wavelength 5000 Å. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will be reduced by a factor of

26. A photocell employs photoelectric effect to convert

27.

28. The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation the metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are

29. The value of Planck's constant is

30. A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance becomes d/2. Then number of electrons emitted per second will be

31.

32. As the intensity of incident light increases