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Chapter 17: Q6PE (page 629)
Air temperature in the Sahara Desert can reach (about ). What is the speed of sound in air at that temperature?
The wave’s speed is 364.6 m/s.
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When sound passes from one medium to another where its propagation speed is different, does its frequency or wavelength change? Explain your answer briefly.
Question: (a) What is the decibel level of a sound that is twice as intense as a \(90.0\;{\rm{dB}}\)sound? (b) What is the decibel level of a sound that is one-fifth as intense as a \(90.0\;{\rm{dB}}\)?
What frequency is received by a mouse just before being dispatched by a hawk flying at it at \(25.0\;{\rm{m/s}}\)and emitting a screech of frequency\({\rm{3500}}\;{\rm{Hz}}\)? Take the speed of sound to be\(331\;{\rm{m/s}}\).
Due to efficiency considerations related to its bow wake, the supersonic transport aircraft must maintain a cruising speed that is a constant ratio to the speed of sound (a constant Mach number). If the aircraft flies from warm air into colder air, should it increase or decrease its speed? Explain your answer.
Sound is more effectively transmitted into a stethoscope by direct contact than through the air, and it is further intensified by being concentrated on the smaller area of the eardrum. It is reasonable to assume that sound is transmitted into a stethoscope\(100\)times as effectively compared with transmission though the air. What, then, is the gain in decibels produced by a stethoscope that has a sound gathering area of\(15.0\;{\rm{c}}{{\rm{m}}^{\rm{2}}}\), and concentrates the sound onto two eardrums with a total area of\(0.900\;{\rm{c}}{{\rm{m}}^{\rm{2}}}\)with an efficiency of\(40.0\% \)?
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