Standing Waves

Front

A standing wave is formed on a string. Which of the following statements is/are true?
∎ Progressive waves are travelling along the string in both directions.
∎ The standing wave is an example of superposition.
∎ The wavelength of the standing wave is d.

Back

Only 1 and 2

Front

The diagram shows the standing wave pattern of a vibrating string which is fixed at ends X and Y.
Which one of these statements is true?

Back

The lowest frequency for this string is one third of its current value.

Front

A receiver R is moved from S (a reflector) towards T (a transmitter). The intensity changes as in the diagram. Which of the following statements is correct?

Back

The frequency of the microwaves is 2.5 GHz.

Front

The moving black dot is called:

Back

an anti-node

Front

The stationary dot is called:

Back

node

Front

Which harmonic is shown? Options: 1st, 2nd, 3rd, 4th

Back

3rd

Front

Which harmonic is shown? Options: 2nd, 3rd, 4th, 5th

Back

5th

Front

A standing wave:

Back

stores energy.

Front

What are the boundary conditions for these standing waves? Options: Anti-nodes at each end., The surface of the string is smooth., The string is free at both ends., There is a node at each end.

Back

There is a node at each end.

Front

The string is 3.5m long. Measure the time period and hence calculate the speed of the underlying travelling waves. Options: 0.7ms^-1, 1.4ms^-1, 2.8ms^-1, 3.5ms^-1

Back

0.7ms^-1