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# What is the smallest possible value for the frequency of the other ultrasonic wave?

Two ultrasonic sound waves combine and form a beat frequency that is in the range of human hearing. The frequency of one of the ultrasonic waves is 98 kHz. (Assume that the frequency range of human hearing is from 20 Hz to 20 kHz.)

(a) What is the smallest possible value for the frequency of the other ultrasonic wave?

kHz

(b) What is the largest possible value for the frequency of the other ultrasonic wave?

kHz

### 2 Answers

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- 4 years ago
35kHz is about 22 on the decibel level. the average peson under 18 can detect a frequency of 10D. after the age of 30 thuis start to decrease by 02/10 Ds p/6 months. by the time they reach 65-70, their range of hearing will have worsened by over twice as much.

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