IB Physics SL C.2 Wave model questions

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Question 1

Paper 2Medium8 marks

A laboratory compares a piezoelectric transducer producing sound in water with an antenna emitting electromagnetic radiation into a vacuum. Both waves have a frequency of $2.00\times10^6\ \mathrm{Hz}$

The speed of sound in water is $1.50\times10^3\ \mathrm{m\,s^{-1}}$ The speed of electromagnetic waves in a vacuum is $3.00\times10^8\ \mathrm{m\,s^{-1}}$

(a)

Calculate the wavelength of the sound wave in water.

[2]

(b)

Calculate the wavelength of the electromagnetic wave and, using the approximate wavelength orders of magnitude in the data booklet, identify its region of the electromagnetic spectrum.

[3]

(c)

Using your answers to (a) and (b), determine the ratio $\lambda_{\text{electromagnetic}}/\lambda_{\text{sound}}$

[1]

(d)

The two signals are directed across an evacuated region towards detectors. State which signal can cross the region and explain your answer with reference to the nature of each wave.

[2]

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