6. Exam Questions: Edexcel A Level

The period of the wave is T. Give a relationship between , T and the speed of the wave inthe solid.Speed/symbol = T or T = or T = Along the line Z mark in the positions of the two compressions and the two rare factions at atime t given by t = t 0 + T/4.1st Mark: 2 C’s or 2 clusters moved ¼ their 2nd mark: To the right6.6 (a) A student is given a ripple tank in which plane waves can be generated.(1)(2)[Total 7 marks]Outline how the student could measure the wave speed v, the frequency f and the wavelength of the waves.Measurement of fUse of strobe OR Connect oscillator to cro (1)Vibrator appears stationary Reference to use of time base (1)Measurement of Measurement across several peaks (1)and average (1)Measurement of vTime at least 3 times a wave across tank (1)Use of v =distance across tanktime(b) The speed v of ocean waves in deep water is given by the relationship(1)(6) g2where g is the acceleration of free fall and is the wavelength of the waves.Derive an expression for T, the period of the waves, in terms of g and .v = f (1)sf (1)22T g(1)(3)Calculate the value of T when the wavelength of the waves is 8.0 m.T = 2.3 s (1)(1 marks)[Total 10 marks]- 28 -