Explain how many more times louder is 70 decibels than 10 decibels?
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State 'law of machines'?
How can you save the sea from oil and sound polution?
What is refraction of light?
Explain what instrument is used to measure volume?
What is Soldering ?
What is the proper definition of light?
Explain what is the ray of light?
How much should be the minimum size of the ordinary mirror, so that and observer standing at the centre of room is able to see the whole of the height of the wall behind him ?
Who first detected radio waves?
explian PIN photodiode and avalanche photodiode
Why are morning and evening less warm than noons ?
Explain the Laws of Thermodynamics ?