The graph in Fig. 19.1 shows how displacement of an ultrasound wave varies with distance. Use the graph in Fig. 19.1 to determine the wavelength of an ultrasound wave. The speed of ultrasound waves in (i) is 4500 m / s. Calculate the frequency of the ultrasound wave in Fig. 19.1. Use the equation: wave speed = frequency × wavelength Give your answer in standard form and to 2 significant figures. – 7522

One thought on “The graph in Fig. 19.1 shows how displacement of an ultrasound wave varies with distance. Use the graph in Fig. 19.1 to determine the wavelength of an ultrasound wave. The speed of ultrasound waves in (i) is 4500 m / s. Calculate the frequency of the ultrasound wave in Fig. 19.1. Use the equation: wave speed = frequency × wavelength Give your answer in standard form and to 2 significant figures. – 7522”

1. i.
   Wavelength = 0.0022 m
   ii.
   To find the frequency, use the formula:
   frequency = speed ÷ wavelength
   = 4500 ÷ 0.0022
   = 2,045,455 Hz
   = 2.0 × 10⁶ Hz(2 significant figures)

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