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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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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 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}

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Beta Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise (Previous Year Questions)>Q 48

When photon of wavelength

λ_{1}

is incident on a metal surface then speed of ejected fastest electron is

v_{1} m s^{- 1}

. If photon of wavelength

λ_{2}

incident on the same metal then speed of ejected fastest electron is

v_{2} m s^{- 1}

. Value of

v_{2}^{2} - v_{1}^{2}

will be:-

The threshold frequency for a photosenstive metal is 7×1013 Hz. If the light of frequency 1014 Hz is incident on this metal, then the maximum kinetic energy of the emitted electron is?

Important Questions on Dual Nature of Matter and Radiation

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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?