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Chapter 12: 6Q (page 328)

The voice of a person who has inhaled helium sounds very high-pitched. Why?

Short Answer

Expert verified

With helium, the speed of sound is high and hence the frequency. Therefore, the pitch of the wave becomes high.

Step by step solution

01

Write the concept of sound producing mechanism 

The sound-producing mechanism is based on resonating cavities, like the throat. The relatively fixed geometry of these cavities determines the relatively fixed wavelengths of sound. The expression for the frequency can be written as:

\(f = \frac{v}{\lambda }\)

Here, v is the speed of the wave and\(\lambda \)is wavelength of the sound wave.

02

Comparison of the speed of sound in helium and air

The speed of the sound wave depends on the gas-filled in cavities. The density of helium is much less than that of air; therefore, the sound's speed is three times as large as in the air. Thus, the person's frequency will go up by a factor of three, so the person sounds high-pitched.

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Most popular questions from this chapter

Question: (I) A piano tuner hears one beat every 2.0 s when trying to adjust two strings, one of which is sounding 350 Hz. How far off in frequency is the other string?

A guitar string vibrates at a frequency of 330 Hz with a wavelength 1.40 m. The frequency and wavelength of this sound in air (20掳C) as it reaches our ears is

(a) same frequency, same wavelength.

(b) higher frequency, same wavelength.

(c) lower frequency, same wavelength.

(d) same frequency, longer wavelength.

(e) same frequency, shorter wavelength.

Explain how a tube might be used as a filter to reduce the amplitude of sounds in various frequency ranges. (An example is a car muffler.)

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(a) the string鈥檚 tension has been dramatically increased.

(b) the string can vibrate with a much larger amplitude.

(c) the string vibrates at a higher frequency.

Is there a Doppler shift if the source and observer move in the same direction, with the same velocity? Explain.
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