Ch 11. Dual Nature Of Radiation And Matter

Question 1

In photoelectric effect, the photoelectric current is independent of

Answer 1

Frequency of incident light

Question 2

For same wavelength of electron and proton, which physical quantity will be same

Answer 2

Angular momentum

Question 3

The rest mass of photon is

Answer 3

Zero

Question 4

The number of photon of frequency 10¹⁴ Hz in radiation of 6.62 J will be

Answer 4

10²⁰

Question 5

The energy of emitted photo electron depends upon

Answer 5

Wavelength of light

Question 6

Electron-volt is an unit of

Answer 6

Energy

Question 7

Statement 1 : Photon cannot be deflected by magnetic and electric field.

Statement 2: Rest mass of photon is zero

Answer 7

Both the statements are true and statement 2nd is the correct explanation of statement 1st

Question 8

In photoelectric effect the maximum kinetic energy of emitted electron depends upon

Answer 8

Frequency

Question 9

In laser ray, a photon stimulates the emission of another photon. The photons have

Answer 9

Same energy

Question 10

Which of the following is the work-function of sodium?

Answer 10

φ₀ = 2.75 eV

Question 11

Energy of photon is equal to

Answer 11

hv

Question 12

Dimension of Planck’s constant is

Answer 12

ML²T⁻¹

Question 13

Wavelength of a particle of mass M moving with velocity V is

Answer 13

λ = h/mV

Question 14

A particle of mass m and charged q is accelerated through a potential V.
The de-Broglie wavelength of particle will be

Answer 14

h/√2qmV

Question 15

The energy of a photon of wavelength λ is

Answer 15

hc/λ