Light of wavelength \(3000 ~{\mathring{A}}\) in Photoelectric effect gives electron of maximum kinetic energy \(0.5 ~\text{eV}\). If the wavelength changes to \(2000 ~{\mathring{A}}\) then the maximum kinetic energy of emitted electrons will be:

1.	less than \(0.5 ~\text{eV}\).
2.	\(0.5 ~\text{eV}\).
3.	greater than \(0.5 ~\text{eV}\).
4.	the photoelectric effect does not occur.

The total energy of an electron is \(3.555~\text{MeV}.\) Its kinetic energy will be:
1.  \(3.545~\text{MeV}\)
2.  \(3.045~\text{MeV}\)
3.  \(3.5~\text{MeV}\)
4.  none of the above

The value of Planck's constant is:

If particles are moving with the same velocity, then the de-Broglie wavelength is maximum for:
1. proton
2. \(\alpha\text-\)particle
3. neutron
4. \(\beta\text-\)particle

When ultraviolet rays strike a metal plate, the photoelectric effect does not occur. It occurs by the incidence of:

1. Infrared rays

2. X-rays

3. Radio wave

4. Lightwave

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

A photo-cell is illuminated by a source of light, which is placed at a distance \(d\) from the cell. If the distance becomes \(\dfrac{d}{2}\), then the number of electrons emitted per second will be: 
1. same
2. four times
3. two times
4. one-fourth