In a longitudinal wave, the distance between two consecutive compressions and two consecutive refractions is called
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Apollo 11, the first artificial satellite that landed humans on moon, was launched in which year?
____________ is the relationship between the variable input and output, keeping all other inputs are held constant.
Isobars have _______.
Which of the following organ does NOT belong to human excretory system?
At the beginning of the 4th centuary CE, the Guptas established a small kingdom in ___.
A unit of power is called a
Why does a piece of cloth, which appears green in sunlight, appear black when it is viewed under red light?