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

Two electromagnetic waves of wavelength smaller than that of violet light ( λ = 400 nm ) are —

(a) Ultraviolet radiations ( λ = 100 to 400 nm ) and

(b) X-rays ( λ = 0.01 to 10 nm )

Ultraviolet radiations are used for sterilizing purposes.

X-rays are used for detection of fracture in bones, teeth, etc. ( i.e., radiography ) and for diagnostic purposes such as CAT scan in medical science.