Spectrum — Question 11

Two properties of ultraviolet radiations which are similar to the visible light are as follows:

1. Ultraviolet radiations travel in a straight line like visible light, with a speed of 3 x 10⁸ m s^-1 in air or vacuum.
2. They obey the laws of reflection and refraction like visible light.

Two properties of ultraviolet radiations which differ from the visible light are as follows:

1. Ultraviolet radiations have wavelength in the range of 100 Å to 4000 Å whereas wavelength of visible light is the range of 4000 Å to 8000 Å.
2. Ultraviolet radiations cause fluorescence on striking a zinc-sulphide screen whereas visible light does not cause such fluorescence.