Explain how the absorption of sound waves differs from the transmission of sound waves.

Explanation :   the difference between absorption and transmission of the sound wave

Absorption of the sound wave : sound absorption when the sound wave hit the surface of a room then the some part of the sound energy will reflect back in to the room and some parts penetrates the surface.

some parts of the sound wave energy are absorbed by converting to heat energy in the material.

Transmission of sound wave : when the sound wave propagate from the source through the medium without reflection and absorption this is called transmission .

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid