Question

You call out to your friend who is standing at a distance of 350 m.
a) if the temperature of the air is 35 degrees Celsius, find the time when your friend will hear you after you have called her.

b) Find the wavelength of your sound if your frequency is 1.3 khz

Answer 1

You will have to look up the speed of sound in meters/s, somewhere around 350, at 35 C ,call it v

distance = speed * time

(a) t = 350/v

(b) period = T = 1/f
wavelength = speed * period

lambda = v /1300

Answer 2

Where did you get 1300 for part b

Answer 3

that is the frequency 1.3 kHz =1300 Hz

period = 1/frequency

Answer 4

So for part a i get 1.02 seconds would that be correct

Answer 5

That sounds good. I did not look up the speed of sound at that temp.

Answer 6

I divided 350 by 343
It says 343 is the speed of sound but not for 35degrees?

Answer 7

No, you must look it up

Answer 8

I looked it up and cant find it

Answer 9

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html

Answer 10

353 m/s

Answer 11

350/353 = .991 seconds

Answer 12

Ok.
And for part b i would would divide 353 by 1300

Answer 13

yes