Question

Pick the answer that correctly completes the sentence: as a sound wave approaches an observer the frequency will _____, the wavelength will____, and the speed of sound will______.A) decrease; increase; stay the same B) increase; increase; increase C) increase; decrease; stay the same D) decrease; decrease; increase

Answer 1

To find

Pick the answer correctly that fits the sentence.

Step-by-step explanation

In a doppler effect, when a sound source apporaches a observer, its frequency increases. As wavelength is inversely proportional so the wavelength decreases. Speed of sound ina given medium is constant, so the speed of sound doesnot change

Thus,

as a sound wave approaches an observer the frequency will increase, the wavelength will decrease, and the speed of sound will stay the same.

Conclusion

The correct option is C) increase; decrease; stay the same.