What is the unit to measure sound intensity?

What is the unit to measure sound intensity?

Ans: – In decibel unit sound is measure.

 

Why do they have many holes at the side of a flute lengthwise?

Ans: – The holes in flute side are for the changing the length of vibration of the sound wave by closing or opening it.

Give three examples of devices that make use of microphones or speakers or both.

Ans: – In television, telephone, and in radio we use the microphone or speakers or both.

 

In a condenser microphone, what will happen if the diaphragm is made very heavy?

Ans: –In case if the diaphragm of the condenser microphone is very heavy then we will see that high frequency will not produce in that.

 

List some uses of satellites.

Ans: – Uses of satellite is-

• Communication
• Earth observing.
• Monitoring
• Surveying
• Photographing

 

If a satellite equipped with cameras remains fixed at one height above ground even as earth rotates and moves in its orbit, what is its possible use?

Ans: – satellite is stationery and earth below it keeps moving because of this view will keep changing. So, without the satellite moving this camera will see whole surface of earth.

 

Arrange the low orbit, geostationary and polar satellites in decreasing order of altitude above Earth (the highest one comes first).

Ans: – The order is geostationary> polar>lower satellite.

 

Which of the satellites are preferred for communication application?

Ans: – Geostationary satellite.

 

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