Question

12. When light travels from one medium to another
which of the following characteristics does not
change? Why?
(1) Velocity
(2) Wavelength
(3) Frequency
(4) Intensity​

Answer 1

Answer:

frequency

Explanation:

According to the given question, we are asked to find what will not change if light travels from one medium to another.

We know, when light travels from one medium to another then this phenomenon is called refraction of light.

In this case light bends a little. The direction of bending is determined by the refractive index of 1st medium and 2nd medium.

So, When light travels from one medium to another its wavelength as well as speed of light changes. If the 2nd medium is denser then wavelength and speed of that particular colour of light will decrease and vice versa.

We know that,

• frequency = speed/wavelength

In this case since, speed and wavelength both decreases or increases simultaneously. Thats why their ratio i.e, frequency remains unchanged.

Thus, we can say frequency will not change.