Sound waves are __ waves, and light waves are _.

Question

Question

This question was previously asked in

ALP CBT 2 Physics and Maths Previous Paper 5 (Held On: 22 Jan 2019 Shift 2)

Answer 1

CONCEPT:

Sound:

A sound is a form of energy that produces a sensation of hearing in our ears.
It is a kind of disturbance that travels through a medium due to repeated vibrations of the particles of the medium about their mean positions.
The disturbance being handed over from one particle to the next.

Light:

Light is a form of electromagnetic radiation that can be detected by the human eye.
When light falls on an object, some part of the light is reflected on our eyes and we are able to see.

EXPLANATION:

Sound waves are longitudinal waves and light waves are transverse waves.
As we know sound waves are longitudinal waves and travel through compression and rarefactions in the medium on the other hand light waves are transverse in nature and do not require medium to travel. Therefore option 3 is incorrect.
As we know that, the sound wave and lightwave travels with different velocity and have a different frequency, therefore the wavelength (λ = v/f) is different for both.
Both sound and light waves follow the law of reflection i.e. the angle of incidence is equal to the angle of reflection.