Question

Two cellos are being played in a duet. At a certain point, one cello plays a note of frequency 196 Hz and the other plays a note of frequency 220 Hz. What is the period of the beat?

0.1 s
0.4 s
0.25 s
4 s

Answer 1

@aaronq I keep getting .04s

Answer 2

the frequency is 4, right?

\(\sf T=\dfrac{1}{f}=\dfrac{1}{4/s}=0.25~s\)

Answer 3

isn't the frequency 24

Answer 4

oh yeah, i read "200 Hz" not 220, my bad.

yeah it's 0.041666 s which is none of the options.

Answer 5

K