the water used here is normal water. now observe if you add lemon juice into the water continuously, the intensity of bulb is is changing or not. what you understand from above result?
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As a term in physics and astronomy it is approximately the period during which the Earth completes one rotation around its axis, which takes about 24 hours. A solar day is the length of time which elapses between the Sun reaching its highest point in the sky two consecutive times.
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