Waves

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Question

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Question 1 : A resonance air column of length 40 cm resonates with a tuning fork of frequency 450 Hz. Ignoring end correction, the velocity of sound in air will be
1. 720 m/s
2. 820 m/s
3. 920 m/s
4. 1020 m/s
Answer
8387

Question 2 : An observer is moving towards a stationary source of frequency 250 Hz with a velocity of 40 m/s. If the velocity of sound is 330 m/s, the apparent frequency heard by the observer will be
1. 320 Hz
2. 300 Hz
3. 280 Hz
4. 260 Hz
Answer
8388

Question 3 : With the increase in temperature, the frequency of the sound from an organ pipe
1. Increases
2. Decreases
3. Remain unchanged
4. Changes erratically
Answer
8389

Question 4 : Loudness of a note of sound is
1. Directly proportional to amplitude of the wave
2. Directly proportional to velocity of the wave
3. Directly proportional to square of amplitude of wave
4. Directly proportional to square of velocity of the wave
Answer
8390

Question 5 : The frequency of the note produced by plucking a given string increases as
1. The length of the string increases
2. The tension in the string increases
3. The tension in the string decreases
4. The mass per unit length of the string increases
Answer
8391