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?
30 Hz.
13.3 Hz.
6.7 Hz.
60 Hz.
Which of the following is an application of the Doppler shift?
Determination of wavelength of sound produced by tuning fork.
Producing line emission spectra.
Determining the frequency of a tuning fork.
Detecting cars moving at high speed on highways.
Suppose that a sound source is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be:
Which of the following waves CANNOT be polarised?
Radio waves
Ultraviolet radiation
Ultrasonic waves
A horizontal string plucked vertically in the middle
Sound vibrations with frequencies greater than 20,000 Hz are called:
