InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
If the radiation is incident on the metallic surface of work function `1. 32 xx 10^(-12) J` . The threshold frequency should beA. `2 xx 10^(21)` HzB. `2 xx 10^(-21)` HzC. `20 xx 10^(21)` HzD. `20 xx 10^(-21)` Hz |
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Answer» Correct Answer - A |
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| 152. |
A metal surface is illuminated by a light of given intensity and frequency to cause photoemission. If the intensity of illumination is reduced to one-fourth of its original value, then the maximum KE of emitted photoelectrons will become.A. unchargedB. half of the original valueC. twice of the original valueD. four times of the original value |
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Answer» Correct Answer - A |
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| 153. |
A caesium photocell , with a steady potential difference of `60 V` across , is alluminated by a bright point source of light `50 cm` away. When the same light is placed `1 m` away the photoelectrons emitted from the cellA. `(n/2)`B. `2n`C. `4n`D. `n` |
| Answer» Correct Answer - C | |
| 154. |
If the energy of a photon corresponding to a wavelength of `6000 Å is 3.32 xx 10^(-19) J` , the photon energy for a wavelength of `4000 Å` will be |
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Answer» Correct Answer - `4.95 xx 10^(-19) J` |
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| 155. |
The wavelength of a photon is `1.4 Å`. It collides with an electron. Its wavelength after collision is `2.0 Å`. Calculate the energy of the scattered electron. |
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Answer» Correct Answer - `4.26 xx 10^(-16) J` |
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| 156. |
The wavelength `lambda_(e )` of an electron and `lambda_(p)` of a photon of same energy `E` are related byA. `lambda_(p) " " alpha " " lambda ^(2)e`B. `lambda_(p) " " alpha " " lambda_(e)`C. `lambda_(p) " " alpha " " sqrt(lambda_(e))`D. `lambda_(p) " " alpha " " 1/sqrt(lambda_(e))` |
| Answer» Correct Answer - A | |
| 157. |
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 `3.57V`. The threshold frequency of the material isA. `4 xx 10^(15)` HzB. `5 xx 10^(15)`HzC. `1.6 xx 10^(15)`HzD. `2.5 xx 10^(15)`Hz |
| Answer» Correct Answer - C | |
| 158. |
When the ultraviolet light of wavelength `1.8 xx 10^(-7)` m falls on certain metal , electrons with maximum K.E. of 1.51 eV are emitted . The work function of the metal isA. 5.0 eVB. 5.4 eVC. 4.5 eVD. 4.0 eV |
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Answer» Correct Answer - B |
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| 159. |
If ultraviolet radiation of 6.2 eV falls of an aluminium surface , then kinetic energy of the fastest emitted electrons is (work function = 4.2 e V)A. `3.2 xx 10^(-19) J`B. `3.2 xx 10^(-21) J`C. `7 xx 10^(-25) J`D. `9 xx 10^(-31) J` |
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Answer» Correct Answer - A |
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