2nd Year Physics Chapter 19 MCQs

Which of the following shows the wave nature of light?

If electron, alpha particle, neutron, and proton have the same K.E then which particle has the longest wavelength?

A brighter light as compared to a dimmer light of the same color will eject

Which of the following light has the highest momentum?

With respect to an observer at the surface of Earth, the pulse rate of astronauts in a moving space station

As a body is heated and its temperature is increased, the radiation becomes richer in

When a body is heated, it first appears

The photoelectric threshold frequency depends upon

The concept of matter waves was given by

Photon A has half the energy of photon B. The ratio of momentum of B to that of A is

The wavelength of a particle of mass 9.11 x 10^–10 kg at rest is

The discrete nature of radiation was introduced by

Of the following particles moving with the same momentum, the wavelength is the largest for

The threshold frequency of metal is f₀. When the light of frequency 4f₀ is incident on the metal, the maximum K.E of photoelectrons is

Light of frequency 2 times the threshold frequency is incident on the metal surface. If the frequency is quartered and intensity is doubled, the photoelectric becomes

In an electron microscope, we use high-speed electrons because:

In a photoelectric effect experiment, stopping potential depend upon

A photocell receives light from a source at 50 cm away and produces a 40mA current in the circuit. When the same source is at distance of 1 m from the photo cell, the current in the circuit will be

The work function of all metals varies from 2 eV to 4eV. It is 4.2 eV for Aluminum and 2eV for Sodium. If these two metals are illuminated by the same light, the threshold frequency of Aluminum is

Choose incorrect properties of photon