Traveling Sound Waves

The speed of sound

v

is given by the formula:

v%20%3D%20f%20%5Ctimes%20%5Clambda

Where: -

f%20%3D%20500%20%5C%2C%20%5Ctext%7BHz%7D

(frequency) -

%5Clambda%20%3D%2080%20%5C%2C%20%5Ctext%7Bcm%7D%20%3D%200.8%20%5C%2C%20%5Ctext%7Bm%7D

(wavelength) Substitute the values:

v%20%3D%20500%20%5Ctimes%200.8%20%3D%20400%20%5C%2C%20%5Ctext%7Bm%2Fs%7D

Now, time

t

to travel 1 km:

t%20%3D%20%5Cfrac%7B%5Ctext%7Bdistance%7D%7D%7B%5Ctext%7Bspeed%7D%7D%20%3D%20%5Cfrac%7B1000%7D%7B400%7D%20%3D%202.5%20%5C%2C%20%5Ctext%7Bseconds%7D

Thus, the correct answer is 2.5 seconds.

Chapter Questions
1 MCQs