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

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The kinetic energy which an electron acquires when accelerated (from rest) through a potential difference of $1 volt$ is called:

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Important Questions on Dual Nature of Matter and Radiation

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 2

If the wavelength of light is

4000 Å,

then the number of waves in

1 mm

length will be

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

Which is having minimum wavelength?

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 4

A metal surface is illuminated by a light of given intensity and frequency to cause photoemission. If the intensity of illumination is reduced to one-fourth of its original value, then the maximum kinetic energy of the emitted photoelectrons would become

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 5

Mark the correct statement: In photo electric effect -

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 6

If the threshold wavelength of light for photoelectric effect from sodium surface is

6800 \overset{°}{A}

then, the work function of sodium is

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 7

When the distance of a point light source from a photocell is

r_{1},

photoelectric current is

I_{1},

If the distance becomes

r_{2}

, then the current is

I_{2}

, The ratio

(I_{1} : I_{2})

is equal to:

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 8

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

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-1>Q 9

In photoelectric effect, we assume the photon energy is proportional to its frequency and is completely absorbed by the electrons in the metal. Then the photoelectric current