Ultrasonics are sound waves of frequency lies______

Who was the inventor of lightning conductor?

_______ Particles has the least penetrating power?

Atom bomb is based on the principle of_____?

The visible range of solar radiation is______?

What is the unit of magnetic flux?

Laser is a device for producing ____

If the temperature inside a room is increased, the relative humidity will ____?

In automatic wrist watches energy is provided by____?

Sound travels in the form of____?