- A train is traveling away from you at 120 km/h. The train blows its 400 Hz whistle. What frequency do you hear?
- The corresponding violin strings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the strings would bring them to the same frequency?
- What is the ratio of the speed of sound in air at 0 degrees Celsius to the speed at 100 degrees Celsius?
- Two speakers are placed side by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound, which of the following is a possible distance from the person to the other speaker?
- A police car has a 800 Hz siren. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observer hear?
- What is the ratio of the intensities of two sounds with intensity levels of 70 dB and 40 dB?
- The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 x 10^-10 W/m^2. What is the intensity level in dB?
- What is the frequency heard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340 m/s.
- A 3.00 m long pipe is in a room where the temperature is 20 degrees Celsius. What is the frequency of the second harmonic if the pipe is closed at one end?
- You are moving at 120 km/h toward a stationary train. The train blows its 400 Hz whistle. What frequency do you hear?
- A music tuner uses a 550 Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrument?
- Sonar is used to determine the speed of an object. A 40 kHz signal is sent out and a 42 kHz signal is returned. How fast is the object moving?
- What determines "loudness" of a musical note?
- The wavelengths of the sounds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 m/s?
- A train is traveling towards you at 120 km/h. The train blows its 400 Hz whistle. What frequency do you hear?
- Two tunes have frequencies of 440 Hz and 444 Hz. What is the beat frequency?
- A sound source approaches a stationary observer. The frequency heard by the observer is
- The intensity level by 15 engines in a garage is 100 dB. What is the intensity level generated by one engine?
- Consider an open pipe of length L. What are the wavelengths of the three lowest tones produced by this pipe?
- At a distance of 15 m from a sound source the intensity level is 60 dB. What is the intensity level at a point 2.0 m from the source? Assume that the source radiates equally in all directions.