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# Physics help, periods of waves watch

1. A sound generator produces 25 waves every 0.1 seconds. If the speed of sound is 330m/s find

a) wavelength of the sound
b) the period of the waves

Ok, for a I got 1.32m.

Wavelength=V/F =330/250 (I got this by using 25/0.1) giving me 1.32m

b) I got stuck with the period.

I thought I could work backwards.....

Period (T) =1/F

F= V/Wavelength

F=330/1.32=250

1/250= 4x10^-3 (0.004) 0.004 seconds

Is this right?

2. (Original post by apronedsamurai)
A sound generator produces 25 waves every 0.1 seconds. If the speed of sound is 330m/s find

a) wavelength of the sound
b) the period of the waves

Ok, for a I got 1.32m.

Wavelength=V/F =330/250 (I got this by using 25/0.1) giving me 1.32m

b) I got stuck with the period.

I thought I could work backwards.....

Period (T) =1/F

F= V/Wavelength

F=330/1.32=250

1/250= 4x10^-3 (0.004) 0.004 seconds

Is this right?

Yeah but you could have gone straight to 1/250 because you already knew f=250... you didn't *need* to reverse your earlier calculation - but if you want to as an exercise that's fine of course.

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