a. Sketch a stationary wave pattern for the microwave experiment in Practical Activity 14.1. Clearly show whether there is a node or an antinode at the reflecting sheet.

b. The separation of two adjacent points of high intensity is found to be 14 mm. Calculate the wavelength and frequency of the microwaves.

PRACTICAL ACTIVITY 14.1

Observing stationary waves

Here we look at experimental arrangements for observing stationary waves, for mechanical waves on strings, microwaves and sound waves in air columns.

Stretched strings: Melde’s experiment

A string is attached at one end to a vibration generator, driven by a signal generator (Figure 14.6). The other end hangs over a pulley and weights maintain the tension in the string. When the signal generator is switched on, the string vibrates with small amplitude. Larger amplitude stationary waves can be produced by adjusting the frequency.

Transcribed Image Text:

vibration pulley string generator weights signal generator