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A certain dog whistle operates at 23.5 KHz. while another
Chapter 13, Problem 41P(choose chapter or problem)
A certain dog whistle operates at 23.5 KHz. while another (brand X) operates at an unknown frequency. If humans can hear neither whistle when played separately, but a shrill whine of frequency 5000 Hz occurs when they are played simultaneously, estimate the operating frequency of brand X.
Questions & Answers
QUESTION: Problem 41P
A certain dog whistle operates at 23.5 KHz. while another (brand X) operates at an unknown frequency. If humans can hear neither whistle when played separately, but a shrill whine of frequency 5000 Hz occurs when they are played simultaneously, estimate the operating frequency of brand X.
ANSWER:
Step 1 of 2
When two dog whistle operates separately we cannot hear the sounds because they are lower frequency than the minimum audible frequency.
When they operate together beating frequency is heard.
The frequency of the first dog whistle is known, beating frequency is known. We will find the frequency of the second dog whistle.