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:

1. $6.63\times {10}^{-34}$ $\mathrm{J}/\mathrm{s}$

2. $6.63\times {10}^{-34}$ $\mathrm{kg}-{\mathrm{m}}^2/\mathrm{s}$

3. $6.63\times {10}^{-34}$ $\mathrm{kg}-{\mathrm{m}}^2$

4. $6.63\times {10}^{-34} J/s$

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

Which one among the following shows the particle nature of light?
1. Photoelectric effect
2. Interference
3. Refraction
4. Polarisation

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

A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then:

J.J. Thomson's cathode-ray tube experiment
demonstrated that:
 

If the K.E. of an electron and a photon is the same, then the relation between their de-Broglie wavelength will be:

1. ${\lambda }_{ph}$ $<$ ${\lambda }_e$

2. ${\lambda }_{ph}$ $=$ ${\lambda }_e$

3. ${\lambda }_{ph}$ $>$ ${\lambda }_e$

4. ${\lambda }_{ph}$ $=2$ ${\lambda }_e$