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Q. When two coherent waves interfere, there is
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Q. Instrument for measuring blueness of the sky or ocean is called ________
Q. Recently developed technique for monitoring foetal growth is
Q. Light beam which is highly directional is called:
Q. The Solar energy produced by
Q. What are the oscillations of a body whose amplitude goes on decreasing with time called as?
Q. Out of the following, which is not emitted by radioactive substance?
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