1. How sound is produced? 2. What do you understand by a ‘wave’? 3. Write three differences between sound and light waves. 4. What do you understand by “sound energy cannot be produced”? 5. What is the name of the wave that can travel through vacuum? 6. Explain by some experiment that sound waves require medium for their propagation. 7. How sound waves travel through some medium? 8. Why sound waves do not propagate through vacuum? 9. What are the transverse waves? Give two examples. 10. What are longitudinal waves? Give two examples. 11. Give two points of difference between longitudinal and transverse waves. 12. How will you prove that the sound waves exhibit longitudinal behaviour? 13. What are rarefaction and compression in case of sound waves? 14. Distinguish between crests and troughs. 15. Write the SI unit of velocity of a wave. 16. What are the factors that describe the sound wave and define them? 17 Why is a thundering sound heard later than lightening? 18. Sound travels with different speeds in different media. Comment. 19. How far is a compression and its nearest rarefaction in a longitudinal wave? 20. Define sound ranging. 21. What is the frequency range of sound for human beings? 22. What are the ultrasonic and supersonic waves? 23. What type of waves are produced by animals like bats and dolphins? 24. Explain two applications of ultra sound waves? 25. Explain how ultrasound waves are used to detect a flaw in an object? 26. Which sound wave is used in ECG (echocardiography)? 27. Give the full form of SONAR. 28. Name the technique used to measure the depth of a sea. 29. How will you determine the depth of a sea using SONAR? 30. How do the bats fly in dark? 31. How RADAR is different from SONAR? 32. Explain the function of ear by explaining its each part.
Answers
1. Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate. Vibrations in air are called traveling longitudinal waves, which we can hear. Sound waves consist of areas of high and low pressure called compressions and rarefactions, respectively.
2. wave definition. In physics, any regularly recurring event, such as surf coming in toward a beach, that can be thought of as a disturbance moving through a medium. Waves are characterized by wavelength, frequency, and the speed at which they move. Waves are found in many forms.
3.Light travels as transverse waves and can travel through a vacuum.Sound travels as longitudinal waves and needs to travel through a solid, liquid or gas: it cannot travel through a vacuum.
4.it means it can not produced as energy can neither b created nor b destroyed but can b transformed from oe form to other .but by doing some mechanical work or other type of energy transformation it can b generated