Why can’t we hear each other on Moon?
Why can’t we hear each other on Moon?
Ans: – As sound is needed a medium for the transfer so in moon there is no air so sounds don’t travel.
Describe 2 experiments to show that sound has vibrations associated with it.
Ans: – (i) Aluminium hanger experiment.
(ii) Tuning fork experiment.
What is the relationship between velocity, wavelength and frequency?
Ans: – V=ny,
Here, v= velocity, n= frequency, y= wavelength,
State 3 differences between sound waves and micro waves.
Ans: –
| Sound wave | Micro wave |
| Longitudinal wave | Transverse wave |
| Travels through medium. | Travels by radiation. |
| Its travelling speed is law | Its travelling speed is high. |
What are the differences between longitudinal and transverse sound waves?
Ans: – The longitudinal wave needs medium to propagation but the transverse wave doesn’t need any types of mediums for the propagation.
Will sound move faster in solid or air?
Ans: – The sound speed is maximum in solid.
What is the basic difference between noise and music?
Ans: – The noise is produced by irregular period whereas the music is produced by regular period.
What makes your voice appear more musical when you sing in a bathroom?
Ans: – As when we speak out or sing a song then the period of the sound is regular in nature so its sounds seem soulful.
How is active SONAR different from passive SONAR?
Ans: – The basic differences between the active and passive sonar are the active sonar works like the radar which transfer the one to another and in passive sonar there is no such use of energy medium or release.
What are the relative merits of SONAR and RADAR? Why is it better to use SONAR in water?
Ans: – There is a benefit of using the sonar as compared to radar in the water. As the radar when transfer the signal in water its range is small because of the absorbing of the water but in sonar it doesn’t see.
How does SONAR help in estimating the distance of an object?
Ans: – SONAR is used for the measurements of the distance between the object which is at a place in under water by reflecting the sound wave. In this case when the sound wave is fell on the object and back to it the. Calculating the time according to distance covered we measure the existence of object under water.
Multiple choice type questions
(i) Which satellite will see a wider area on Earth?
(a) A low earth orbit satellite (b) A high earth orbit satellite
(c) A medium earth orbit satellite.
Ans: – Option(b).
India’s first self launched satellite was
a) IRS (b) Aryabhat (c) Rohini (d) INSAT.
Ans: – Option(b).
For the same velocity, will a higher frequency of a sound wave mean
(a) Higher wavelength
(b) Lower wavelength
(c) The same wavelength.
Ans: – Option(i).
Sound travels fastest in
a) Solid (b) Liquid (c) Gas.
Ans: – Option(a).
The most suitable medium for RADAR would be
(a) Gas (b) Liquid (c) Solid.
Ans: – Option(a).
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