(i)Arrange the following electromagnetic radiation in ascending order of their frequencies:

X-rays, microwaves, gamma rays, radio waves

(ii) Write two uses of any two of these radiation.

Solution,
i) ascending order 
Radio waves<microwaves <x rays <gamma rays .
ii) uses of x rays 
a) They are used for medical purposes to detect the breakage in human bones
b) They are used as a scanner to scan the luggage of passengers in airports, rail terminals, and other places.
Uses of radio waves 
a) radio waves are used for television and FM and AM radio broadcasts