Question

Veena and Rani are on the moon, Veena calls out her friend, but Rani does not hear Veena’s call even though she is near. Discuss.

Answer 1

Hint: Sound can be described as a longitudinal wave which has both compressions as well as rarefactions. Sound waves always require a medium. Since the moon has no medium we can’t hear any sound on the surface of the moon. And also sound needs a medium to propagate . Because of this reason even though Veena and Rani are near they can’t hear when one of them calls out the other.

Complete answer:
Sound can be described as a longitudinal wave which has both compressions as well as rarefactions. Sound waves always require a medium. That medium can be solid, liquid or gases. Because of some vibrations in these mediums due to the molecules, sound waves propagate. The sound waves can travel more faster in solid substances than liquids or gases. Because solids are those materials in which molecules are tightly packed than liquids or gases. Hence sound waves are an example of mechanical waves. That is, mechanical waves always require a material medium.
Whereas in case of light waves it doesn’t require any medium to propagate since light waves are transverse waves.
Since the moon has no medium we can’t hear any sound on the surface of the moon. And also sound needs a medium to propagate. Because of this reason even though Veena and Rani are near they can’t hear when one of them calls out the other.

Note: Sound can be described as a longitudinal wave which has both compressions as well as rarefactions. Sound waves always require a medium. That medium can be solid, liquid, or gases. Because of some vibrations in these mediums due to the molecules, sound waves propagate. The sound waves can travel faster in solid substances than liquids or gases. Because solids are those materials in which molecules are tightly packed than liquids or gases.