Two observers A and B are provided with a source of the sound of frequency 500 Hz. A remains stationary and B moves away from him at a velocity of 18 m/s. How many beats per second are observed by B, the velocity of sound in air being 330 m/s
A column of air is set into vibration and the note emitted gives 10 beats per second when a tuning fork of frequency 440 Hz is sounded, the temperature being 20°C. The frequency of beats decreases when the tuning fork is loaded with a small piece of wax. at what temperature the unloaded fork and the air column will be in unison?
The noise from an airplane engine 25.0 m from an observer is found to have an intensity of 45.0 dB. What will be the intensity in decibel when the plane flies overhead at an altitude of 2.0 Km?
A note produces 2 beats/s with a tuning fork of frequency 480 Hz and 6 beats/s with a tuning fork of 472 Hz. Find the frequency of the note.
The intensity level from a loudspeaker is 100 dB at a distance of 10 m. What is its intensity level at a distance of 100 m?
The intensity level from a loudspeaker is 100 bB at a distance of 10 m. What is its intensity level at a distance of 200 m?
A car is moving away from a stationary listener with a velocity of 20 m/s. if the horn is sounding at frequency 512 Hz, calculate the change in pitch of the sound received by the listener. (Velocity of sound in air = 330 m/s).
An observer traveling with a constant velocity of 20 m/s, passes close to a stationary source of sound and notices that there is a change of frequency of 50 hz as he passes the source. What is the frequency of the source? Speed of the sound in air = 340 m/s
A source of sound generates sound waves that travel with a speed of 340 m/s. The frequency of the source is 500 Hz. Find the frequency of the sound heard if:
When a jet plane is flying at an elevation of 1000 m the sound level on the ground is 4.0 dB. What would be the intensity level on the ground when its elevation is as low as 50 m?
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