Related InterviewSolutions

• 1. The vibrating bodies produce waves in the form of ……… 2. For the propagation of sound, a ………. is required. 3. The frequency range of audible waves is ……….. 4. The frequency of infrasonic waves is ………… 5. The sound waves with a frequency greater than 20 KHz are known as ……….. 6. The wavelength of sound waves ranges from ………..7. Sound waves are ………. 8. If wavelength of a wave is λ and its time period is T, then velocity of sound wave is ……….. 9. If n is the frequency and λ is the wavelength of sound wave then is velocity of wave is given by ………… 10. The ascending order of velocity of sound in solids, liquids and gases is given by ………… 11. Velocity of sound in a gas is inversely proportional to the ………… of the medium. 12. Velocity of sound in solid is directly proportional to the square root of the ……….. of the medium. 13. Sound can be heard from long distances clearly during ………….. 14. When the temperature of a gas changes by one degree Celsius, the velocity of sound changes by ……….. 15. In the case of reflection of sound, angle of incidence is equal to …………. 16. When sound waves undergo reflection by convex surface, its intensity is ……….. 17. ……….. are used when sound waves have to be focused at a point. 18. In ……….. surfaces, sound from one focus will always be reflected to the other focus.7. Sound waves are ………. 8. If wavelength of a wave is λ and its time period is T, then velocity of sound wave is ……….. 9. If n is the frequency and λ is the wavelength of sound wave then is velocity of wave is given by ………… 10. The ascending order of velocity of sound in solids, liquids and gases is given by ………… 11. Velocity of sound in a gas is inversely proportional to the ………… of the medium. 12. Velocity of sound in solid is directly proportional to the square root of the ……….. of the medium. 13. Sound can be heard from long distances clearly during ………….. 14. When the temperature of a gas changes by one degree Celsius, the velocity of sound changes by ……….. 15. In the case of reflection of sound, angle of incidence is equal to …………. 16. When sound waves undergo reflection by convex surface, its intensity is ……….. 17. ……….. are used when sound waves have to be focused at a point. 18. In ……….. surfaces, sound from one focus will always be reflected to the other focus.29. If the apparent frequency is n' = \(\frac{V}{V+V_S}\) n then source moves ………….. the ……….. listener.30. If a listener moves towards the ………. source, the apparent frequency  n' = \(\frac{V+V_L}{V}\)n.
• Fill up the blanks: 1. Rapid back and forth motion of a particle about its mean position is called ....... 2. If the energy in a longitudinal wave travels from south to north, the particles of the medium would be vibrating in …………3. A whistle giving out a sound of frequency 450 Hz, approaches a stationary observer at a speed of 33 ms-1 . The frequency heard by the observer is (speed of sound = 330 ms-1) ……….. 4. A source of sound is travelling with a velocity 40 km/h towards an observer and emits a sound of frequency 2000 Hz. If the velocity of sound is 1220 km/h, then the apparent frequency heard by the observer is …………
• A train moving with velocity 30 ms-1 blows a whistle of frequency 516 Hz. Find the pitch of the sound heard by a passenger in another train approaching the first at a speed of 15 ms-1 , the velocity of sound = 330 ms-1.
• Sound waves travel faster in solids than in liquids and gases. Why?
• Mention two cases in which there is no Doppler effect in sound?
• A radio station broadcasts its programme at 219.3 m wavelength. Determine the frequency of radio waves if velocity of radio waves 3 × 108 m/s.
• Two waves are propagating with same amplitude and nearly same frequency in opposite they result in: (a) longitudinal wave (b) transverse wave (c) stationary wave (d) resonance wave
• What is the relation between frequency and wavelength?
• What is the minimum distance needed for an echo?
• What is a longitudinal wave?