## Wednesday, 10 September 2014

### Waves and vibrations

1.  What is meant by:
(a) a transverse wave
(b) a longitudinal wave?

2. Write down one example of each.

3. Calculate the speed of the following waves:
(a) Frequency 200 Hz  wavelength 2 m
(b) Frequency 500 Hz  wavelength 0.5 m
(c) Frequency 100 kHz  wavelength 2 cm

4. Calculate the wavelength of the following waves:
(a) Speed = 300 m/s                                        frequency = 150 Hz
(b) Speed = 300 m/s                                       frequency = 3000 Hz
(c) Speed = 300 000 000 m/s        frequency = 1000 MHz

5. Draw a diagram of a transverse wave and mark on it:
(a) the amplitude of the wave
(b) the wavelength of the wave

6. A certain sound wave has a large amplitude but a small wavelength.
Choose one of the following statements that you think describes the sound best.
(a) soft and low pitched
(b) loud and high pitched
(c) soft and high pitched
(d) loud and low pitched

7. A loud low pitched sound wave and a soft and high pitched sound wave and both fed into a microphone one after the other and the result shown on an oscilloscope screen.
Draw a diagram to show what you would see on the screen.

8. There are two radio stations broadcasting on the FM radio band. One has a frequency of 101.7 MHz and the other a frequency of 100 MHz.
(a) Which one has the lowest frequency?
(b) which one has the longest wavelength
(c) what is the wavelength of the radio waves from the station with the longest wavelength?