What is its period in the water?

[aerogurl2]

i need some help on this problem:
A sonar signal of frequency 1.00x10^6 Hz has a wavelength of 1.50mm in water.

a) What is its period in the water?
b)What is its period in the air?

Can someone guide me through the steps in order to arrive to the solution or explain to me how to solve this? Thanx

 

[nrqed]

i need some help on this problem:
A sonar signal of frequency 1.00x10^6 Hz has a wavelength of 1.50mm in water.

a) What is its period in the water?
b)What is its period in the air?

Can someone guide me through the steps in order to arrive to the solution or explain to me how to solve this? Thanx

What is the definition of period? It is simply one over the frequency.
When a wave changes medium (water to air) does the frequency change?

 

[aerogurl2]

the medium doesn't travel with the wave so it wouldn't effect the period is that right? so the period for both water and the air would be the same?

 

[nrqed]

the medium doesn't travel with the wave so it wouldn't effect the period is that right? so the period for both water and the air would be the same?

Your conclusion is correct but it's not because the medium does not travel with the wave. When a wave changes medium, its speed *and* its wavelength changes but the frequency does not change (it is ultimately connected to conservation of energy but you should not worry about that).

Patrick

 

[aerogurl2]

oki thanks for your help Patrick

 

[nrqed]

oki thanks for your help Patrick

You are most welcome. And best luck!