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Comprehension l Two trains A and B are moving with speeds 20 m s and...

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Comprehension l Two trains A and B are moving with speeds 20 m s and 30 m s respectively in the same direction on the same straight track with B ahead of A The engines are at the front ends The engine of train A blows a long whistle Assume that the sound of the whistle is composed of components varying in frequency from f 800 Hz to f 1120 Hz as shown in the figure The spread in the frequency Thighest frequency lowest frequency is thus 320 Hz The speed of sound in still air is 340 m s J The speed of sound of the whistle is A 340 m s for passengers in A and 310 m s for passengers in B B 360 m s for passengers in A and 310 m s for passengers in B C 310 m s for passengers in A and 360 m s for passengers in B D 340 m s for passengers in both the trains The distribution of the sound intensity of the whistle as observed by the passengers in train A is best represented by 2007 7 A C Intensity Intensity f Frequency f2 Frequency B D Intensity Intensity Intensity f pro f2 Frequency 1120 f Frequency f2 Frequency 2007

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