What is the frequency of the signal in air?

Question

A) 15 hz B)5.0*10^-8 m/s C)1.00*10^5 hz D)1.50*10^3
Proof how you got the answer.

A) 15 hz B)5.0*10^5 m/s C)1.00*10^5 hz D)1.50*10^3
These are the answer chooses.
Proof how you got the answer.

Answer 1

You only revealed the possible answers, not the question.

Assuming the question is asking about wavelengths, the general rule of thumb is

300 / F(in MHz) = wavelength (in m)
and conversly,
300 / wavelength = F

Answer 2

You have not mentioned electromangnetic signal. I assume it is.

15 Hz is frequency itself.
5.0*10^8 m/s speed which is more than the speed of light, it is impossible.
1.00*10^5 Hz is also a frequency in itself - nothing to calculate.
1.50*10^3 what?? if it is wave length, then the frequency is 3*10^8 / 1.50*10^3 = 2*10^5 Hz.

Answer 3

I can see why no one has tried to answer this one...it is inconsistent or incomplete. For one thing "hz" stands for Hertz = 1 cycle/sec. That is the frequency; so your A answer is 15 hz and your C is the number you gave there. D has no answer because you failed to specify what that number you gave is (wavelength, frequency, velocity...what). And worst of all, you fail to tell us what's vibrating...is it light, is it air, is it metal, is it subatomic strings...what?

If you want to be a scientist, you have to think more precisely. Units, for example, are important. Numbers without units are generally meaningless. At the very least, when you ask a question in Answers copy the question in its entirety from the textbook.