Asound wave traveling in air has a frequency f and wavelength λ. a second sound wave traveling in air has wavelength λ/2. what is the frequency of the second sound wave?

2f

Explanation:

The relationship between the speed of a sound wave (v), its frequency (f) and its wavelength is

For the first wave speed, we have

(1)

Since the speed of a sound wave depends only on the medium, we can say that the second wave travels at same speed v (because it is still travelling in air, as the first wave). The wavelength of the second wave is , so if we call its frequency f', the new equation is

(2)

And if we equate (1) and (2), we find

statement #3 on andre"s list is false.

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures