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The MCQs below are drawn from the Physics subject category.
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461
An organ pipe P1 closed at one end vibrating in its first overtone and another pipe P2 open at both ends vibrating in third overtone are in resonance with a given tuning fork. The ratio of the length of P1 to that of P2 is
Closed pipe first overtone is 3rd harmonic (3v/4L1) and open pipe third overtone is 4th harmonic (2v/L2); equating gives L1/L2 = 3/8.
462
A star producing light of wavelength 6000 Å moves away from the earth with a speed of 5 km s^-1. Due to Doppler effect, the shift in wavelength will be (c = 3 x 10^8 m s^-1)
The described motion describes one vibration; time period is duration, frequency is count per second.
466
A wave of frequency 100 Hz is sent along a string towards a fixed end. When this wave travels back, after reflection a node is formed at a distance of 10 cm from the fixed end of the string. The speeds of incident (and reflected) waves are
Water surface waves involve both transverse motion of particles and longitudinal components, so they have both types.
470
The displacement y of a particle in a medium can be expressed as y = 10^-6 sin(100 t - 20 x + 1/4) m where t is in seconds and x in meters. The speed of the wave is:
