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

HARD

NEET

IMPORTANT

Earn 100

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:

25% studentsanswered this correctly

Important Questions on Dual Nature of Matter and Radiation

EASY

NEET

IMPORTANT

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

EASY

NEET

IMPORTANT

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

(ν > ν_{t h})

EASY

NEET

IMPORTANT

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

When stopping potential is applied in an experiment on photoelectric effect, no photocurrent is observed. This means that

EASY

NEET

IMPORTANT

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

If the frequency of light in a photoelectric experiment is doubled, the stopping potential will

EASY

NEET

IMPORTANT

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

The energy of a photon of frequency

v

is

E = h ν

and the momentum of a photon of wavelength

λ

is

p = \frac{h}{λ}

. From this statement one may conclude that the wave velocity of light is equal to

EASY

NEET

IMPORTANT

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

The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate. A light source is put on and a saturation photocurrent is recorded. An electric field is switched on that has a vertically downward direction.

MEDIUM

NEET

IMPORTANT

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

In a photoelectric experiment, the frequency and intensity of a light source are both doubled. Then consider the following statements.

(i) The saturation photocurrent remains almost the same.

(ii) The maximum kinetic energy of the photoelectrons is doubled.

EASY

NEET

IMPORTANT

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

A point sources of light is used in a photoelectric effect. If the sources is removed farther from the emitting metal, the stopping potential