Dual Nature of Radiation and Matter

A light source of wavelength illuminates a metal surface and electrons are ejected with maximum kinetic energy of 2 eV . If the same surface is illuminated by a light source of wavelength 2, then the maximum kinetic energy of ejected electrons will be (The work function of metal is 1 eV )

1. 5 eV
2. 3 eV
3. 2 eV
4. 6 eV

A proton, an electron and an alpha particle have the same energies. Their de-Broglie wavelengths will be compared as :

1. p > e >
2. < p < e
3. e > > p
4. p < e <

UV light of 4.13 eV is incident on a photosensitive metal surface having work function 3.13 eV. The maximum kinetic energy of ejected photoelectrons will be:

1. 4.13 eV
2. 1 eV
3. 7.26 eV
4. 3.13 eV

A proton and an electron are associated with same de-Broglie wavelength. The ratio of their kinetic energies is: (Assume h = 6.63 10-34 J s, me = 9.0 10-31 kg and mp = 1836 times me)

1. 1 : 11836
2. 1 : 1836
3. 1 : 1836
4. 1 : 1 1836

A proton and an electron have the same de Broglie wavelength. If Kp and Ke be the kinetic energies of proton and electron respectively, then choose the correct relation :

1. Kp > Ke
2. Kp = Ke
3. Kp < Ke
4. Kp = Ke2

Which of the following phenomena is not explained by wave nature of light? Choose the most appropriate answer from the options given below:

1. C only
2. B, D only
3. A, C only
4. E only

In photoelectric experiment energy of 2.48 eV irradiates a photo sensitive material. The stopping potential was measured to be 0.5 V. Work function of the photo sensitive material is :

1. 1.98 eV
2. 1.68 eV
3. 2.48 eV
4. 0.5 eV

When UV light of wavelength 300 nm is incident on the metal surface having work function 2.13 eV, electron emission takes place. The stopping potential is : (Given hc = 1240 eV nm)

1. 4 V
2. 2 V
3. 4.1 V
4. 1.5 V

Given below are two statements : [figure] In the light of the above statements, choose the most appropriate answer from the options given below.

1. Statement I is correct and Statement II is incorrect
2. Statement I is incorrect but Statement II is correct
3. Both Statement I and Statement II are correct
4. Both Statement I and Statement II are incorrect

Which of the following statement is not true about stopping potential (V0) ?

1. It depends upon frequency of the incident light.
2. It is 1/e times the maximum kinetic energy of electrons emitted.
3. It increases with increase in intensity of the incident light.
4. It depends on the nature of emitter material.