y13 Physics

Wave Equation- Problems


1. The range of sound frequencies which can be detected by a person is 17.0 Hz to 20.0 Khz. What is the corresponding range of wavelengths if the speed of sound in air is 340 ms?

2.
a) BBC Radio 4 broadcasts on a wavelength of 1.5 km what is it’s frequency?
b) What are the wavelengths of a TV station that transmits vision on 500 MHz and sound on 505 MHz?
c) What is frequency of yellow light of wavelength 0.6 mm? C= 3x108 ms-1

3. The floats of two men fishing in a lake from boats are 21m apart. A disturbance at a point in line with the two floats sends out a train of waves along the surface of the water so that the floats bob up and down 20 times per minute. A man in a third boat observes that when the float of one of his colleagues is on the crest of a wave when the other is in a trough and that there is one crest between them. What is the velocity of the wave?

4. A source of sound of frequency 550 Hz emits waves of wavelength 618 mm in air at 20°C. What is the velocity of sound in air at this temperature ? What would the wavelength of sound from this source be in air at 0°C (c=330ms-1 )