Which of the following is an application of the Doppler shift?
Detecting cars moving at high speed on highways.
Producing line emission spectra.
Determining the frequency of a tuning fork.
Determination of wavelength of sound produced by tuning fork.
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?
What determines "loudness" of a musical note?
Which of the following waves CANNOT be polarised?
Radio waves
Ultraviolet radiation
A horizontal string plucked vertically in the middle
Ultrasonic waves
Sound vibrations with frequencies greater than 20,000 Hz are called:
