Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 15

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Monochromatic radiation of intensity $I$ falls on a metal surface and the number of photoelectrons and their maximum kinetic energy are $N$ and $T$ respectively. If the intensity of radiation is $2 I$ , what is the number of emitted electrons and their maximum kinetic energy respectively?

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Important Questions on Dual Nature of Radiation and Matter

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 16

The maximum kinetic energy of photoelectrons emitted from a surface, when photons of energy $6 eV$ fall on it, is $4 eV$ . The stopping potential in volts is:

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 17

Ultraviolet light falls on metal surface then electrons are emitted named as

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 18

A cathode emits

1.8 \times 1 0^{14}

electrons per second, when heated. When

400 V

is applied to anode all the emitted electrons reach the anode. The charge on electron is

1.6 \times 1 0^{- 19} C

. The maximum anode current is

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 19

The light of radiation

300 nm

falls on a photocell operating in the saturation mode. The spectral sensitivity is

4.8 mA W^{- 1}

. The yield of photoelectrons (i.e. number of electrons produced per photon) is

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 20

In photoelectric effect, stopping potential depends on

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 21

A

5 watt

source emits monochromatic light of wavelength

5000 \overset{\circ}{A}

. 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

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 22

Potential difference applied to an X -ray tube is

5 kV

and the current through it is

3.2 mA

. The number of electrons striking the target per second is Take

e = 1.6 \times 10^{- 19} C

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 23

Which of the following graph is wrong for photo electric effect experiment?