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Graph is plotted between maximum kinetic energy $(E_{k})$ of electron with frequency of incident photon $(v)$ in Photo electric effect. The slope of curve will be-

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Important Questions on Dual Nature of Matter and Radiation

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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 10

The maximum energy of electrons released in a photocell is independent of

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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 11

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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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 12

When a certain metallic surface is illuminated with monochromatic light of wavelength

λ

, the stopping potential for photoelectric current is

6 V_{0}

. When the same surface is illuminated with light of wavelength

2 λ

, the stopping potential is

2 V_{0}

. The threshold wavelength of this surface for photoelectric effect is

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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 13

A photoelectric cell is illuminated by a point source of light

1 m

away. When the source is shifted to

2 m

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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 14

A photo sensitive metallic surface has work function

h v_{0}

. If photons of energy

2 h v_{0}

fall on this surface, the electrons come out with a maximum velocity of

4 \times 10^{6} {ms}^{- 1}

. When the photon energy is increased to

5 h v_{0}

, then maximum velocity of photo electrons will be-

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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 15

In a photoelectric experiment, with light of wavelength

λ,

the fastest electron has speed

v .

If the exciting wavelength is changed to

\frac{3 λ}{4},

the speed of the fastest emitted electron will become

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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 16

1.5 mW

400 nm

light is directed at a photoelectric cell. If

0.10 %

of the incident photons produce photoelectrons, the current in the cell is:

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Beta Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 17

Let

K_{1}

be the maximum kinetic energy of photoelectrons emitted by light of wavelength

λ_{1}

and

K_{2}

corresponding to wavelength

λ_{2}

. If

λ_{1} = 2 λ_{2}

, then

Graph is plotted between maximum kinetic energy Ek of electron with frequency of incident photon (v) in Photo electric effect. The slope of curve will be-

Important Questions on Dual Nature of Matter and Radiation

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Graph is plotted between maximum kinetic energy $(E_{k})$ of electron with frequency of incident photon $(v)$ in Photo electric effect. The slope of curve will be-