Exam 12: Sound

An ambulance is generating a siren sound at a frequency of 2,000 Hz. The speed of sound is 345.0 m/s. The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s. If the observer is stationary, what is the frequency of the siren perceived by the observer?

The sound of a band is rated as 60 dB at a distance of 10.0 m. What is the sound intensity level of the band when one is 20.0 m from the band?

A 50.0 cm long organ pipe is filled with air at 10.0°C and is open at both ends. The speed of sound in air at 0°C is 331 m/s. Another 50.0 cm long organ pipe is filled with air at 15.0°C and is open at both ends. What is the beat frequency between the fundamental modes of the two organ pipes?

An ambulance is generating a siren sound at a frequency of 2,400 Hz. The speed of sound is 345.0 m/s. If the observer is traveling at a velocity of 24.00 m/s toward the stationary ambulance, then what is the frequency of the siren perceived by the observer?

A 30.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The speed of sound in air at 0°C is 331 m/s. What is the wavelength of the fourth mode of vibration?

The speed of longitudinal waves in a long brass rod is 3,260 m/s. If the density of brass is 8,470 kg/m³, then what is the elastic modulus of brass?

An ambulance is generating a siren sound at a frequency of 2,400 Hz. The speed of sound is 345.0 m/s. If the observer is traveling at a velocity of 24.00 m/s away from the stationary ambulance, then what is the frequency of the siren perceived by the observer?

A 40.0 cm long organ pipe is filled with air and is open at both ends. The speed of sound in air at 0°C is 331 m/s. If the temperature of the air increases by 10°C, then what is the frequency of the fundamental mode?

An ambulance is generating a siren sound at a frequency of 2,400 Hz. The speed of sound is 345.0 m/s. If the ambulance is traveling at a velocity of 24.00 m/s toward the stationary observer, then what is the frequency of the siren perceived by the observer?

An ambulance is generating a siren sound at a frequency of 2,400 Hz. The speed of sound is 345.0 m/s. If the ambulance is traveling at a velocity of 24.00 m/s away from the stationary observer, then what is the frequency of the siren perceived by the observer?

A 3.0 m organ pipe is open at both ends and contains air. The speed of sound in air is 331 m/s. What is the wavelength of the lowest frequency mode?

A string with a mass per length of 2.00 g/m is stretched with a force of 120 N between two points that are 0.400 m apart. The fundamental frequency of the stretched string is in tune with the fundamental frequency of an organ pipe filled with air and open at both ends. The speed of sound in air at 0°C is 331 m/s. What is the length of the organ pipe?

A 40.0 cm long organ pipe is filled with air and is open at both ends. The speed of sound in air at 0°C is 331 m/s. What is the frequency of the fundamental mode?

An organ pipe is 80.0 cm long and is open at one end and closed at the other. The frequency of the third mode is 200 Hz higher than the frequency of the second mode. What is the speed of sound?

You see lightning flash followed 8.2 seconds later by the sound of thunder. The ambient air temperature is 12^°C. The speed of sound in air at 20^°C is 343 m/s. Approximately how far are you from the lightning?

A 20.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The speed of sound in air at 0°C is 331 m/s. What is the frequency of the fundamental mode?

There are two identical organs with pipes having fundamental frequencies of 264.0 Hz at 20°C. One organ is located at the front of the auditorium where the temperature is 20°C and one at the back where the temperature in 25.0°C. What is the beat frequency when the two organs sound this note simultaneously?

A 40.0 cm long organ pipe is filled with air at 0°C and is open at both ends. The speed of sound in air at 0°C is 331 m/s. Another 40.0 cm long organ pipe is filled with air at 20°C and is open at both ends. What is the beat frequency between the fundamental modes of the two organ pipes?

Compared to the speed of a 400 Hz sound, the speed of a 200 Hz sound through air is

An ambulance is generating a siren sound at a frequency of 2,000 Hz. The speed of sound is 345.0 m/s. The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s. If the ambulance is stationary, what is the frequency of the siren perceived by the observer?