Solution Found!
(a) Is the beat frequency produced when a 245-Hz tone and
Chapter 14, Problem 79P(choose chapter or problem)
Problem 79P
(a) Is the beat frequency produced when a 245-Hz tone and a 240-Hz tone are played together greater than, less than, or equal to the beat frequency produced when a 140-Hz tone and a 145-Hz tone are pîayed together? (b) Choose the best explanation from among the following:
I. The beat frequency is determined by the difference in frequencies and is independent of their actual values.
II. The higher frequencies will produce a higher beat frequency.
III. The percentage change in frequency for 240 and 245 Hz is less than for 140 and 145 Hz, resulting in a lower beat frequency.
Questions & Answers
QUESTION:
Problem 79P
(a) Is the beat frequency produced when a 245-Hz tone and a 240-Hz tone are played together greater than, less than, or equal to the beat frequency produced when a 140-Hz tone and a 145-Hz tone are pîayed together? (b) Choose the best explanation from among the following:
I. The beat frequency is determined by the difference in frequencies and is independent of their actual values.
II. The higher frequencies will produce a higher beat frequency.
III. The percentage change in frequency for 240 and 245 Hz is less than for 140 and 145 Hz, resulting in a lower beat frequency.
ANSWER:
Solution 79P
Step 1 of 2
Part a
When two waves having frequencies and
interfere, the expression for beat frequency is given as,
The beat frequency of the tones 245 Hz and 240 Hz is ,
Hz
Hz
The beat frequency of the tones 140 Hz and 145 Hz is,
Hz
Hz
Therefore, both beat frequencies are equal.