Question

PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!

The hum (sound wave) you may have heard from a transformer has a frequency of about 100 Hz and a wavelength of 3.4 m. How fast does the hum travel?

Remember that v= λ ∙ f

Answer 1

Wave speed=wavelength*frequency

So:

Wavelength=3.4 m.

Frequency=100 Hz

3.4 m*100 Hz=340 meters per second.

Answer 2

Did you see that formula at the bottom of the question ? The one that says. V = L x f ?

That's where you can stick the numbers that the question also gives you.

L = 3.4 m

f = 100 Hz

Puttum in the formula and then it says

V = (3.4 m) (100 Hz)

The question wants to know what ' v ' is.

Do that one multiplication and you'll have it.

It's 340 m/s.

Surprise surprise ! It's the speed of sound in air.