What Is the Beat Frequency Between Two Close Tuning Fork Frequencies?

[sonutulsiani]

Homework Statement

Two tuning forks are struck and the sounds from each reach your ears at the same time. One sound has a frequency of 256 Hz, and the second sound has a frequency of 258 Hz. The underlying "hum" frequency that you hear is:
A. 2 Hz
B. 256 Hz
C. 258 Hz
D. 257 Hz

Homework Equations

The Attempt at a Solution

I got it as 2 HZ

 

[Delphi51]

Probably. Computer generated question?

The hesitation is because no one can hear 2 Hz.

 

[sonutulsiani]

Nah homework question!

 

[sonutulsiani]

Is it 2HZ?

 

[denverdoc]

yes, but I agree with Delphi--two hz is not audible. Beat frequencies are generated by sums and differences of the fundamentals. The only choice which makes sense is 2.