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This section contains two paragraphs. Based on each paragraph, there are 3 questions. Each question has 4 choices (A), (B), (C) and (D) out of which ONLY ONE is correct.
Paragraph for Questions 14–16:
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 fromf 1 f 2
as shown in the figure. The spread in the frequency (highest frequency – lowest frequency) is thus, 320 Hz. The speed of sound in still air is 340 m/s.
This section contains two paragraphs. Based on each paragraph, there are 3 questions. Each question has 4 choices (A), (B), (C) and (D) out of which ONLY ONE is correct.
Paragraph for Questions 14–16:
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
as shown in the figure. The spread in the frequency (highest frequency – lowest frequency) is thus, 320 Hz. The speed of sound in still air is 340 m/s.
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