Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 43

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Earn 100

Assertion: Slope of $K_{\max} versus ν$ graph is same for all metals having different work function.

Reason: $K_{m a x} = h ν - ϕ$ , where all symbols have their usual meaning.

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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 44

When the light of wavelength

300 nm

falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, the light of wavelength

600 nm

is sufficient for liberating photoelectrons. The ratio of the work function of the two emitters is

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 45

Assertion: K.E. of all photo-electrons are same, when monochromatic light is incident on a metal.

Reason:

K_{m a x} = h ν - ϕ

, where all symbols have their usual meaning.

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 46

In the photoelectric effect, the K.E. of electrons emitted from the metal surface depends upon

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 47

According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 48

Which one of the following is true in photoelectric emission?

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 49

Photoelectric effect takes place in element

A

. Its work function is

2.5 eV

and threshold wavelength is

λ

. Another element $B$ has work function of

5 eV

. Then, find out the wavelength that can produce photoelectric effect in

B

.

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 50

The idea of the quantum nature of light has emerged in an attempt to explain

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Achieve CUET (UG) Physics Practice Book>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 51

Find the maximum kinetic energy of the photo electron liberated from the surface of lithium by electromagnetic radiation whose electric component varies with time as

E = a (1 + \cos (ω t)) \cos (ω_{o} t)

, where

a

is a constant,

ω = 6 \times 10^{14} s^{- 1}

and

ω_{o} = 3.6 \times 10^{15} s^{- 1}

, work function of lithium,

φ = 2.39 eV