The intensity of a point source at a distance d from the source is I. What is the intensity at a distance 2d from the source?
You double your distance from a sound source that is radiating equally in all directions. What happens to the intensity level of the sound? It drops by:
Which of the following is an application of the Doppler shift?
Producing line emission spectra.
Determination of wavelength of sound produced by tuning fork.
Detecting cars moving at high speed on highways.
Determining the frequency of a tuning fork.
A small vibrating object on the surface of a ripple tank produces waves of frequency 20 Hz and speed 60 cm/s. If the source S is moving to the right as shown the figure, with a speed of 20 cm/s.
What frequency would an observer at point C hear?
60 Hz.
30 Hz.
6.7 Hz.
13.3 Hz.
An open pipe of length L is resonating at its fundamental frequency. Which statement is correct?
