Which of the following waves CANNOT be polarised?
Ultraviolet radiation
A horizontal string plucked vertically in the middle
Ultrasonic waves
Radio waves
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.
6.7 Hz.
13.3 Hz.
60 Hz.
An open pipe of length L is resonating at its fundamental frequency. Which statement is correct?
As the temperature of the air increases, what happens to the velocity of sound? (Assume that all other factors remain constant.).
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:
