FM22 P22 Q5 Doppler and Wave Polarisation | Feb/March 2022 | Cambridge A Level 9702 Physics

Описание: 9702/22/F/M/22: (a) (i) State the conditions required for the formation of a stationary wave. (ii) State the phase difference between any two vibrating particles in a stationary wave between two adjacent nodes. #9702m22p22 #ASphaseDifferenceP2

(b) A motorcycle is travelling at 13.0 m s–1 along a straight road. The rider of the motorcycle sees a pedestrian standing in the road directly ahead and operates a horn to emit a warning sound. The pedestrian hears the warning sound from the horn at a frequency of 543 Hz. The speed of the sound in the air is 334 m s–1. #ASdopplerP2

(i) Calculate the frequency, to three significant figures, of the sound emitted by the horn.
(ii) The motorcycle rider passes the stationary pedestrian and then moves directly away from her. As the rider moves away, he operates the horn for a second time. The pedestrian now hears sound that is increasing in frequency. State the variation, if any, in the speed of the motorcycle when the rider operates the horn for the second time.

(c) A beam of vertically polarised monochromatic light is incident normally on a polarising filter, as shown in Fig. 5.1. The filter is positioned with its transmission axis at an angle of 20° to the vertical. The incident light has intensity I0 and the transmitted light has intensity IT.

(i) By considering the ratio IT/I0, calculate the ratio of amplitude of transmitted light over amplitude of incident light. Show your working.
(ii) The filter is now rotated, about the direction of the light beam, from its starting position shown in Fig. 5.1. The direction of rotation is such that the angle of the transmission axis to the vertical initially increases. Calculate the minimum angle through which the filter must be rotated so that the intensity of the transmitted light returns to the value that it had when the filter was at its starting position. #ASpolarisationP2 #Lv3

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