What is the correct definition of a rarefaction? Orin a medium through which sound is passing, a zero-pressure region of a sound
wave
in a medium through which sound is passing, a low-pressure region of a sound
wave
in a medium through which sound is passing, a low-altitude region of a sound
wave
in a medium through which sound is passing, a high-pressure region of a sound
wave

Why is metal often used for cooking pan?

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

The seven sisters, seven stars located more than 400 light-years away in the taurus constellation can be seen here with venus and another constellation, orion. the seven stars stay grouped together but seem to move, like the planet venus. why do stars seem to move like planets in the night sky?