Two loudspeakers, d1 = 2.00 m, are in phase. assume the amplitudes of the sound from the speakers are approximately the same at the position of a listener, who is d2 = 3.75 m directly in front of one of the speakers. consider the audible range for normal hearing, 20 hz to 20 khz. (a) what is the lowest frequency that gives the minimum signal (destructive interference) at the listener's ear? (b) what is the lowest frequency that gives the maximum signal (constructive interference) at the listener's ear?

Lowest frequency that gives the minimum signal is 343 Hz

lowet frequency for maximum signal 686 Hz

Explanation:

D_1 = 2.00 m

D _2  =3.75 m

Δx =

     =

     = 0.5 m

for minimum distructive interference,  the path difference is

Δx =  

for minimum n = 0

             = 2*0.5 = 1 m

lowest frequency f =

where c is speed of sound in air 343 m/s

b) lowet frequency for maximum signal

for minimum CONSTRUCTIVE interference,  the path difference is

Δx =  

for minimum n = 1

             = 0.5 m

lowest frequency f =

f  =

wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.