Calculate the time period (in seconds) of a sound wave of wavelength 5m travelling with a speed of 500 m/s.
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During the free fall of the object, the decrease in potential energy, at any point in its path, appears as an equal amount of increase in _________________.
Which of the following instruments is used to measure electric current?
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An element has an atomic weight of W and an atomic number of N. The number of protons in the nucleus of its atom is
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Who is the author of "Everyone Has A Story"?