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A photoelectric surface is illuminated successively by monochromatic light of wavelength $λ$ and $\frac{λ}{2} .$ If the maximum kinetic energy of the emitted photoelectrons in the second case is $3$ times that in the first case, the work function of the surface of the material is: $(h = Planck' s constant, c = speed of light)$

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Important Questions on Dual Nature of Matter and Radiation

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Previous Year Questions)>Q 40

The threshold frequency for a photosenstive metal is

7 \times 10^{13} Hz

. If the light of frequency

10^{14} Hz

is incident on this metal, then the maximum kinetic energy of the emitted electron is?

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Previous Year Questions)>Q 41

An electron of mass

m

and a photon have same energy

E

. The ratio of de-Broglie wavelengths associated with them is:

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Previous Year Questions)>Q 42

When a metallic surface is illuminated with radiation of wavelength

λ

, the stopping potential is

V

. If the same surface is illuminated with radiation of wavelength

2 λ

, the stopping potential is

\frac{V}{4}

. The threshold wavelength for the metallic surface is:

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Previous Year Questions)>Q 43

Photons with energy

5 eV

are incident on a cathode

C

in a photoelectric cell. The maximum energy of emitted photoelectrons is

2 eV

. When photons of energy

6 eV

are incident on

C

, no photoelectrons will reach the anode

A

, if the stopping potential of

A

relative to

C

is :-

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Previous Year Questions)>Q 44

The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature

T

(kelvin) and mass

m

, is:

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Previous Year Questions)>Q 45

The photoelectric threshold wavelength of silver is

3250 \times 10^{- 10} m

. The velocity of the electron ejected from a silver surface by the ultraviolet light of wavelength

2536 \times 10^{- 10} m

is:-
(Given

h = 4.14 \times 10^{- 15} eV s

and

c = 3 \times 10^{8} m s^{- 1}

)

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Previous Year Questions)>Q 46

An electron of mass

m

with an initial velocity

\vec{v} = v_{0} \hat{i} (v_{0} > 0)

enters an electric field

\vec{E} = - E_{0} \hat{i} (E_{0} = constant > 0)

t = 0

. If

λ_{0}

is its de-Broglie wavelength at time

t = 0

then wavelength at time

t

is:

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Previous Year Questions)>Q 47

When the light of frequency

2 v_{0}

(where

v_{0}

is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is

v_{1}

. When the frequency of the incident radiation is increased to

{5 v}_{0}

the maximum velocity of electrons emitted from the same plate is

v_{2}

. The ratio of

v_{1}

v_{2}

Important Questions on Dual Nature of Matter and Radiation

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