Question

If we put a cardboard (say 20 cm × 20 cm) between a light source and our eyes, we can't see the light. But when we put the same cardboard between a sound source and out ear, we hear the sound almost clearly. Explain.

Answer 1

Explanation:

• When we put the carton between the source of light and the receiver, we can’t see the light.
• That’s because the body is opaque and not letting light pass through it.
• Light is also an electromagnetic wave which only moves in a straight path.
• Sound waves can also move sideways and is not always upright.
• Static can be heard. The main reason is that static involves a material medium and is a transverse wave, meaning it can travel perpendicular to the surface.