Wave properties and the wave equationEdexcel International A Level Physics: Mind map

Exam questions on Wave properties and the wave equation

1. A loudspeaker emits a continuous note of frequency 680 Hz in air, where the speed of sound is 340 m s⁻¹.
   The frequency of the loudspeaker is now doubled. State and explain what happens to the speed and to the wavelength of the sound.2 marks
2. A ship's echo-sounder transmits pulses of ultrasound of frequency 50 kHz. The wavelength of the ultrasound in sea water is 3.0 cm.
   A pulse is transmitted vertically downwards and its echo from the sea bed is received 0.40 s later. Calculate the depth of the sea bed.2 marks
3. A transverse wave travels along a long stretched string. The wave has amplitude 12 mm, frequency 25 Hz and wavelength 0.80 m. At time t = 0 a point P on the string is at its maximum positive displacement.
   Describe what is meant by a transverse wave and how the string moves as the wave passes along it.3 marks