1. Why do sound waves get reflected from hard surfaces both even and rough.
2. What is echo? What should be the minimum distance between the observer and obstacle for echo to be heard?
3. What are reverberations? How can reverberations be minimised in auditorium / hall?
4. Why is ultrasound so useful? Describe two major applications of ultrasound.
5. What is SONAR? What are the applications of this technique?
6. How do the bats locate any obstacle during their flight?
7. Our ears are very delicate and fragile organs. Give some suggestions to take their proper care.
8. Draw a flowsheet showing the stepwise operation of the human ear.
9. Why are the ceilings of concert halls curved?
10. An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s-?
11. A submarine emits a SONAR pulse which returns from an underwater cliff in 1.02 s. If the speed of sound in water is 1531 ms, how far away is the cliff?
12. How is some defects in a metal block be detected using ultrasound?
13. What is the audible range of a normal human eye?
14. Does sound follow the same laws of reflection as light does?
2. What is echo? What should be the minimum distance between the observer and obstacle for echo to be heard?
3. What are reverberations? How can reverberations be minimised in auditorium / hall?
4. Why is ultrasound so useful? Describe two major applications of ultrasound.
5. What is SONAR? What are the applications of this technique?
6. How do the bats locate any obstacle during their flight?
7. Our ears are very delicate and fragile organs. Give some suggestions to take their proper care.
8. Draw a flowsheet showing the stepwise operation of the human ear.
9. Why are the ceilings of concert halls curved?
10. An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s-?
11. A submarine emits a SONAR pulse which returns from an underwater cliff in 1.02 s. If the speed of sound in water is 1531 ms, how far away is the cliff?
12. How is some defects in a metal block be detected using ultrasound?
13. What is the audible range of a normal human eye?
14. Does sound follow the same laws of reflection as light does?
