1. Unit of Frequency is
2.
is required for the propogation of sound.
3. What kind of musical instrument is a Harmonium?
4. What is ultrasound?
5. What is the range of sound frequency audible to human ear?
6. Sound propogates faster in a solid than in air. Give reasons.
7. How does the arstronauts communicate with each other?
8. Sound propogates in the form of ------- waves.
9. Why is the sound produced by a male has a lower pitch compared to a female voice?
10. What are the causes for Hearing loss?
Answers
Answer:
1. hertz
2.medium
3.percussion instrument
4.Ultrasound is considered a safe and affordable imaging technology to help a doctor make a diagnosis regarding soft tissue and organs in the body
5.20 hz to 20,000 hz
6.Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air.
7.The astronauts have devices in their helmets which transfer the sound waves from their voices into radio waves and transmit it to the ground (or other astronauts in space). This is exactly the same as how your radio at home works.
8. sound
9.
10.hearing high volume sound for long time