Question

Choose the odd one out giving reason:

1) Sound, Longitudinal wave, Light, Mechanical wave
2)Compression, high density, rarefaction​

Answer 1

Light

• as it is the only one that can travel through vacuum

Rarefaction

• Rarefaction is the reduction of an item's density, the opposite of compression.[1] Like compression, which can travel in waves (sound waves, for instance), rarefaction waves also exist in nature.