V (stopping potential) is plotted against 1 λ , where λ is wavelength of incident radiations, for two metals

θ 1 = θ 2 , for any two metals

Metal 1 may be gold and metal 2 may be cesium

θ 1 > θ 2 , if metal- 1 is gold and metal- 2 is cesium

θ 1 > θ 2 , if metal- 1 and metal- 2 are gold and copper respectively

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.

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 11

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Earn 100

The de-Broglie wavelength of a particle accelerated with $100 volt$ potential difference is $10^{- 9} m$ . The de-Broglie wavelength of particle if it is accelerated by $1600 volt$ potential difference will be

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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 12

The velocity of most energetic electron emitted from a metallic surface is tripled when the frequency

ν

of the incident radiation is doubled. The work function of this metal will be (

h

is Planck's constant)

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 13

Work function of a material depends on

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 14

If work function of target material is

2.34 eV

and wavelength of incident light is

4.36 \times 10^{- 7} m

then minimum potential required to stop the photo current is about

(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 15

Monochromatic light of wavelength

440 nm

is produced. The power emitted by light is

18 mW .

The number of photons emitted per second by light beam is

(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 1

Which of the following statements is not correct?

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Gamma Question Bank for Medical Physics>Chapter 28 - Dual Nature of Radiation and Matter>Assigment>Q 2

The stopping potential $V$ for photo-electric emission from a metal surface is plotted along $Y$ -axis and frequency $v$ of incident light along $X$ -axis. A straight line is obtained as shown. Planck's constant is given by

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