The equation for beat frequency is as follows:(adsbygoogle = window.adsbygoogle || []).push({});

f_b = |f_2 - f_1|

Meaning the absolute value of the difference between 2 frequencies. But when you figure out the possiblilities of f_2, you analyze both -f_b and f_b, if you are using the absolute value because negative beat frequencies don't exsist, then why do you analyze the negative beat frequency? You calulate as:

f_2 = f_b + f_1

OR

f_2 = -f_b + f_1

I don't see why you should analyze the negative beat frequency if it doesn't exsist.

Someone please help soon.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Negative Beat frequency

**Physics Forums | Science Articles, Homework Help, Discussion**