Dual Nature of Radiation and Matter

When ultraviolet rays are incident on a metal plate, photoelectric effect does not occur. It occurs by incidence of

1. infrared rays
2. X-rays
3. radio waves
4. microwaves

Which of the following is not the property of cathode rays?

1. It produces heating effect
2. It does not deflect in electric field
3. It casts shadow
4. It produces fluorescence.

Which one among the following shows particle nature of light?

1. photoelectric effect
2. interference
3. refraction
4. polarization

A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance becomes d/2, then number of electrons emitted per second, will be

1. remain same
2. four times
3. two times
4. one-fourth

The interplanar distance in a crystal is 2.8 10-8 m. The value of maximum wavelength which can be diffracted is

1. 2.8 10-8 m
2. 5.6 10-8 m
3. 1.4 10-8 m
4. 7.6 10-8 m

By photoelectric effect, Einstein proved

1. E = h
2. K.E. = 12 mv2
3. E = mc2
4. E = -Rhcn2

Who evaluated the mass of electron indirectly with help of charge

1. Thomson
2. Millikan
3. Rutherford
4. Newton