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QUESTION BANK FOR CLASS XI PHYSICS - WAVES

W A V E S

  1. Why longitudinal waves are called pressure waves?
  2. Transverse waves are not formed in liquids and gases why?
  3. What is a harmonic wave function?
  4. We can recognize our friends by their voices .Why?
  5. A source of sound is moving towards a stationary observer. Is the increase in pitch due to (1) increase in velocity of sound? (2) Actual or apparent change in wavelength? (3) Both?
  6. What is the function of water in the resonance apparatus? Can we use any other liquid?
  7. Why a tuning fork has two prongs? What are the conditions for resonance of air column with a tuning fork?
  8. What are fundamental note and overtones? What are harmonics?
  9. Briefly explain the terms wavelength, frequency, time period and velocity of wave motion. Establish relation between them.
  10. Explain some significant properties of wave motion.
  11. State Newton,s formula for velocity of sound in air. Point out the error and hence discuss Laplace, s correction. Discuss the effect of temperature, pressure, and density on velocity of sound in gases.
  12. Obtain the equation of a plane progressive simple harmonic wave.
  13. Establish the relation between particle velocity and wave velocity.
  14. State and explain superposition of waves.
  15. What are stationary waves? Discuss graphical method for the formation of stationary waves on stretched strings.
  16. Discuss the characteristics of stationary waves.
  17. Audible frequencies have a range 40Hz. To 30,000 Hz. Express this range in terms of (1) period T, (2) wavelength λ in air, and (3) angular frequency, Given velocity of sound in air is 350 m/s. (2.5 x 10-2s, 3.3 x 10-5s, 8.75m, 0.012m, 80 rad/second 60,000 rad /sec.)
  18. If the splash is heard 4.23 seconds after a stone is dropped into a well , 78.4m deep, find the velocity of sound in air. (340.87 m/sec)
  19. Find at what temperature the velocity of sound in air will be 1 times the velocity at 110C.(3660)
  20. The velocity of sound in air at N.T.P is 331m/s . Find its velocity when the temperature rises to 910C and its pressure is doubled.(382.1m/s)
  21. For the traveling harmonic wave, y = 2.0 cos2[ 10t – 0.0080x + 0.35], where x and y are in cm. and t is in sec.What is the phase difference between oscillatory motion at two points separated by a distance of (1) 4m, (2) 0.5 m (3) λ/2 (4) 3λ/4. (400cm. =0.8 rad. , 3π/2 rad.)
  22. Two tuning forks when sounded together, produce 3 beats per second. On loading one of them with a little wax, 20 beats are heard per second.Find its frequency if that of other is 386 Hz. (383 Hz.)
  23. Calculate the velocity of sound in a gas in which two wave lengths 2.04m produce 20 beats in 6 seconds.(353.6 m/s).
  24. A set of 24 tuning forks is arranges in series of increasing frequencies. If each fork gives 4 beats with the preceding one and the last fork is octave of the first,
  25. calculate the frequency of the first , calculate the frequency of the first and the last fork. (184 Hz.)
  26. A string 1m long with mass 0.1gm/cm is under a tension of 400newton. Find the fundamental frequency.(100 Hz.).
  27. A steel rod 100cm long is clamped at the middle of it. The fundamental frequency of longitudinal vibrations of the rod is given to be 2.53 kHz. What is the speed of sound in steel(5.06 x 103m/sec.)
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