Arrange the following electromagnetic radiations in decreasing order of their frequencies:
- (i) Infrared radiation
- (ii) Microwave radiation
- (iii) Ultraviolet radiation
Select the correct order using the code given below:
- A(ii), (iii), (i)
- B(iii), (i), (ii)
- C(iii), (ii), (i)
- D(i), (ii), (iii)
Show answer and explanation
Correct answer: (b) (iii), (i), (ii)
Explanation
Frequency increases from radio waves to gamma rays: radio < microwaves < infrared < visible < ultraviolet < X-rays < gamma.
So in decreasing order of frequency, the three given are:
- (iii) ultraviolet (highest);
- (i) infrared;
- (ii) microwave (lowest).
The order is (iii), (i), (ii).