Question

Why can’t you see your friend from the other side of the wall when you can hear him?
(A) The wall is transparent to sound
(B) The wavelength of sound is greater than light
(C) The secondary wavelets formed in light ways undergo destructive interference
(D) Both B and C

Answer 1

Hint : Here we will use the properties of the sound and the light waves to find out the reason why we can hear the sound from the other side of the wall and can not see.

Complete Step By Step Answer:
We know that, wall is the opaque substance and the light does not pass through the opaque substance and therefore we can not see through it.
Since sound can travel and is transmitted by air and give its multidirectional effect, we can hear on the other side of the wall and light is directional and is not transmitted by the medium and therefore we can not see to the other side of the wall.
From the given multiple choices, the option B is the correct answer.

Note :
Know the basic difference between the types of materials and the properties to justify these types of statements.
The materials through which light penetrates completely are known as the transparent material. For example – Clear glass and clear air.
The material which allows only some of the visible light to pass through it is known as the translucent materials. For Example – Sunglasses and gemstones.
The materials which do not allow any light to pass through it are known as the opaque. For Example – Wood, iron.