Question

The frequency of light in air is $5\times {10}^{14}Hz$. What will be the frequency of light when it travels in water:

• A. $5\times {10}^{14}Hz$
• B. ${10}^{15}Hz$
• C. $2.5\times {10}^{12}Hz$
• D. $2.5\times {10}^{14}Hz$

Answer 1

The correct option is A $5\times {10}^{14}Hz$

Frequency of light remains same even if it passes from one medium to another. When light passes from one medium to another the velocity and wavelength changes. Thus frequency of light will remain unchanged as $5\times {10}^{14}Hz$ even if when it travels from air to water.