When a sound wave gets reflected from denser medium phase changes by

When sound waves are reflected from a denser medium

When sound is reflected from a denser medium

When a wave gets reflected from rarer medium its phase increases by amount pi rad.

When sound is reflected from a denser medium,

When sound is reflected from a denser medium,

When a wave is reflected from a denser medium, the change in phase is:

If sound waves reflected from the denser medium, then there is

What happens to a particle velocity when a sound wave is reflected from a rarer medium and a denser medium ?