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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

A stone is dropped from the top of a cliff. The splash it makes when striking the water below is heard 2.7 s later. How high is the cliff?

Figure 12鈥�32 shows various positions of a child on a swing moving toward a person on the ground who is blowing a whistle. At which position, A through E, will the child hear the highest frequency for the sound of the whistle? Explain your reasoning.

Question: (II) (a) Estimate the power output of sound from a person speaking in normal conversation. Use Table 12-2. Assume the sound spreads roughly uniformly over a sphere centered on the mouth. (b) How many people would it take to produce a total sound output of 60 W of ordinary conversation? (Hint: Add intensities, not dBs.)

(III) A police car sounding a siren with a frequency of 1580 Hz is traveling at 120.0 km/h. (a) What frequencies does an observer standing next to the road hear as the car approaches and as it recedes? (b) What frequencies are heard in a car traveling at 90.0 km/h in the opposite direction before and after passing the police car? (c) The police car passes a car traveling in the same direction at 80.0 km/h. What two frequencies are heard in this car?

Question: (II) What would be the sound level (in dB) of a sound wave in air that corresponds to a displacement amplitude of vibrating air molecules of 0.13 mm at 440 Hz?
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