A source of unknown frequency gives 4 beats/s when sounded with a source of known frequency of 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second when sounded with a source of frequency of 513 Hz. The unknown frequency will be:
1. 246 Hz
2. 240 Hz
3. 260 Hz
4. 254 Hz
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA wave travelling in the +ve x-direction having maximum displacement along y-direction as 1 m, wavelength and frequency of Hz, is represented by:
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo sources of sound placed close to each other, are emitting progressive waves given by,
=4sin600t and =5sin608t
An observer located near these two sources of sound will hear:
1. 4 beats per second with intensity ratio 25:16 between waxing and waning
2. 8 beats per second with intensity ratio 25:16 between waxing and waning
3. 8 beats per second with intensity ratio 81:1 between waxing and waning
4. 4 beats per second with intensity ratio 81:1 between waxing and waning
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo waves are represented by the equations and ,
where x is in metres and t in seconds. The phase difference between them is:
1. 1.25 rad
2. 1.57 rad
3. 0.57 rad
4. 1.0 rad
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySound waves travel at 350 m/s through warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air:
1. increase by a factor of 20
2. increase by a factor of 10
3. decrease by a factor of 20
4. decrease by a factor of 10
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA transverse wave is represented by y = Asin(ωt -kx). At what value of the wavelength is the wave velocity equal to the maximum particle velocity?
1. A/2
2. A
3. 2A
4. A
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA tuning fork of frequency 512 Hz makes 4 beats/s with the vibrating string of a piano. The beat frequency decreases to 2 beats/s when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was:
1. 510 Hz
2. 514 Hz
3. 516 Hz
4. 508 Hz
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA wave in a string has an amplitude of 2 cm. The wave travels in the positive direction of the x-axis with a speed of 128 m/s and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is:
1. y = (0.02)m sin(7.85x+1005t)
2. y = (0.02)m sin(15.7x -2010t)
3. y = (0.02)m sin(15.7x+2010t)
4. y = (0.02)m sin(7.85x -1005t)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe driver of a car travelling with speed 30 m/s towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is 330 m/s, the frequency of reflected sound as heard by the driver is:
1. 550 Hz
2. 555.5 Hz
3. 720 Hz
4. 500 Hz
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyEach of the two strings of lengths 51.6 cm and 49.1 cm is tensioned separately by 20 N of force. The mass per unit length of both the strings is the same and equals 1 g/m. When both the strings vibrate simultaneously, the number of beats is:
1. 5
2. 7
3. 8
4. 3
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology