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Photoelectric effect supports particle nature of light because

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Important Questions on Dual Nature of Matter and Radiation

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IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 2>Q 17

Select the correct alternative(s):
When photons of energy

4.25 eV

strike the surface of a metal

A

, the ejected photo electrons have maximum kinetic energy

T_{A} eV

and de Broglie wave length

λ_{A}

. The maximum kinetic energy of photo electrons liberated from another metal

B

by photons of energy

4.70 eV

T_{B} = (T_{A} - 1.50) eV

. If the de-Broglie wave length of these photo electrons is

λ_{B} = 2 λ_{A}

, then:

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Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 3>Q 1

During the propagation of electromagnetic waves in a medium

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Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 3>Q 2

Electrons with de-Broglie wavelength

λ

fall on the target in an

X -

ray tube. The cut-off wavelength of the emitted

X -

rays is

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Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 3>Q 3

The allowed energy for the particle for a particular value of

n

is proportional to length of string

a

as:

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Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 3>Q 5

Estimate the wavelength at which plasma reflection will occur for a metal having the density of electrons

N = 4 \times 10^{27} m^{- 3}

. Take

ε_{0} = 10^{- 11}

and

m = 10^{- 30}

, where these quantities are in proper SI units.

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Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 3>Q 7

A pulse of light of duration

100 ns

is absorbed completely by a small object initially at rest. Power of the pulse is

30 mW

and the speed of light is

3 \times 10^{8} {ms}^{- 1}

. The final momentum of the object is :

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Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 3>Q 9

A metal surface is illuminated by the light of two different wavelengths

248 nm

and

310 nm

. The maximum speeds of the photoelectrons corresponding to these wavelengths are

u_{1}

and

u_{2}

, respectively. If the ratio

u_{1} : u_{2} = 2 : 1

and

h c = 1240 eV nm

, the work function of the metal is nearly

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Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 3>Q 10

For photo-electric effect with incident photon wavelength

λ

, the stopping potential is

V_{0}

. Identify the correct variation(s) of

V_{0}

with

λ

and

\frac{1}{λ}

Photoelectric effect supports particle nature of light because

Important Questions on Dual Nature of Matter and Radiation

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