Name the phenomenon which illustrate the particle nature of light.

Photoelectric effect illustrates the particle nature of light. The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. When electromagnetic radiation(light) strikes a suitable substance , it transfers its momentum to the electrons in the target and knock them out of the surface . As only particle can have mass ( and thus momentum), This proves that light is a particle.

E M B I B E

Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 20

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Earn 100

How many photons are emitted by a laser source of $5 \times 10^{- 3} W$ operating at $632.2 nm$ in $2 s ?$

$(h = 6.63 \times 10^{- 34} J s)$

50% studentsanswered this correctly

Important Questions on Dual Nature of Radiation and Matter

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 21

If in a photoelectric cell, the wavelength of incident light is changed from

4000 \overset{\circ}{A}

to

3000 \overset{\circ}{A}

, then change in stopping potential will be

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 22

Find the number of electrons emitted per second by a

24 W

source of monochromatic light of wavelength

6600 Å,

assuming

3 %

efficiency for photoelectric effect (take

h = 6.6 \times 10^{- 34} Js

)

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 23

A proton is accelerated through

225 V .

Its de Broglie wavelength is

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 24

For same energy, find the ratio of

λ_{photon}

and

λ_{electron}

(Here

m

is mass of electron)

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 25

What should be the velocity of an electron so that its momentum becomes equal to that of a photon of wavelength

5200 Å ?

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 26

Figure shows four situations in which an electron is moving in electric/magnetic field. In which case the de Broglie wavelength of electron is increasing?

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 27

For an electron microscope, which of the following is false?

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 28

Variation of momentum of particle