Question

Which of the following type of waves have the shortest wavelength?

• A. Radio waves
• B. X-rays
• C. Micro waves
• D. Ultra violet waves

Answer 1

The correct option is B X-rays

In an electromagnetic spectrum different types of waves have different wavelengths.
The range of wavelengths of the given waves are tabulated below.
$$\begin{array}{cc}\text{Type of wave}& \text{Wavelength range (m)}\\ \text{Radio waves}& \text{>}{10}^{-3}\\ \text{X rays}& {10}^{-9}\text{-}{10}^{-12}\\ \text{Micro waves}& {10}^{-3}\text{-}2.5\text{x}{10}^{-5}\\ \text{Ultra violet waves}& \text{4x}{10}^{-7}\text{-}{10}^{-9}\end{array}$$
From the given table, X rays have shortest wavelength and high frequency. Their wavelengths range from ${10}^{-9}$ to ${10}^{-12}$ m.