A wave has wavelength 50 Å. (a) Name the wave. (b) State it's speed in vacuum. (c) State it's one use.

Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.

State the approximate range of wavelength associated with (a) ultraviolet rays, (b) visible light, and (c) infrared rays.

Name two electromagnetic waves of wavelength smaller than that of violet light. State one use of each.