Physics Questions
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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.