PHYS 102 Chapter 6 Homework (ERAU)
The force stretching the D string on a certain guitar is 131 N. The string’s linear mass density is 0.006 kg/m. What is the speed of the waves on the string?
The coldest and hottest temperatures ever recorded in Switzerland are −43.2°F (231 K) and 106.7°F (315 K), respectively. What is the speed of sound in air at each temperature?
A 800Hz sound travels through pure neon. The wavelength of the sound is measured to be 0.54 m. What is the speed of sound in neon?
What frequency of sound traveling in air at 20°C has a wavelength equal to 1.8 m, the average height of a person?
What is the wavelength (in mm) of 2 million Hz ultrasound as it travels through human tissue?
The huge volcanic eruption on the island of Krakatoa, Indonesia, in 1883 was heard on Rodrigues Island, 4,782 km (2,970 miles) away. How long did it take (in seconds) for the sound to travel to Rodrigues? (Assume the air temperature is 20°C.)
A steel cable with total length 64 m and mass 130 kg is connected to two poles. The tension in the cable is1,661 N, and the wind makes the cable vibrate with a frequency of 2 Hz. Calculate the wavelength of the resulting wave on the cable.
A geologist is camped 4,834 m (about 3 miles) from a volcano as it erupts.
A person stands at a point 219 m in front of the face of a sheer cliff. If the person shouts, how much time will elapse before an echo is heard? (Assume the
speed of sound is 344 m/s.)
The sound level measured in a room by a person watching a movie on a home theater system varies from 40dB during a quiet part to 80 dB during a loud part. Approximately how many times louder is the latter sound? (enter only a number as your answer)
Give an example of a wave that does not need a medium in which to travel and a wave that does need a medium.
The speed of an aircraft is sometimes expressed as a Mach number: Mach 1 means that the speed is equal to the speed of sound. If you wish to determine the
speed of an aircraft going Mach 2.2, for example, in meters per second or miles per hour, what additional information do you need?
If you were actually in a battle fought in space like the ones shown in science fiction movies, would you hear the explosions that occur?
A lowfrequency sound is heard, and then a highfrequency sound is heard. Which sound has a longer wavelength?
A person riding on a bus hears the sound from a horn on a car that is stopped.What is different about the sound when the bus is approaching the car compared
to when the bus is moving away from the car ?
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