Answer:
Microwaves has the shortest frequency.
Explanation:
In an electromagnetic spectrum, the different waves are arranged in an increasing or decreasing order of wavelength or frequency. Frequency of a wave is defined as the number of oscillations or vibrations produced. We have to write the name of wave having shortest frequency.
Frequency of infrared wave, \(f_1=3\times 10^{12}\ Hz-4,3\times 10^{14}\ Hz\)
Frequency of microwaves wave, \(f_2=3\times 10^{9}\ Hz-3\times 10^{12}\ Hz\)
Frequency of ultraviolet waves, \(f_3=7,5\times 10^{14}\ Hz-3\times 10^{16}\ Hz\)
Frequency of x-rays, \(f_1=3\times 10^{16}\ Hz-3\times 10^{17}\ Hz\)
So, from the above data it is clear that the microwaves has the shortest frequency.
Hence, the correct option is (b) " microwaves ".
