Name two properties of ultraviolet radiations which are similar to the visible light and two which differ from visible light.

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.