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Q. These waves cannot be transmitted through vacuum.
Sound waves cannot travel in the vacuum of space because there is no medium to transmit these mechanical waves.
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Q. Which electromagnetic radiation is used for satellite communication ?
Q. Beta rays emitted by a radioactive material are
Q. Bats can sense obstacles because they produce
Q. Heat transfer by radiation mainly depends upon
Q. Why does the surface water of a pond remain cool in a hot day?
Q. Which colour has got maximum refractive index in glass?
Q. 1 m/s equals ________ km/hr
Q. The apparatus used to measure the intensity of light is known as
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