Can pockets of vacuum persist in an ideal gas? assume that a room is filled with air at 20∘c and that somehow a small spherical region of radius 1 cm within the room becomes devoid of air molecules. estimate how long it will take for air to refill this region of vacuum. assume the atomic mass of air is 29 u.

What causes the formation of ocean currents?

Select all the correct answers. which three statements about electromagnetic radiation are true?

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s. part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.