Question
State two observations which show that atom is not indivisible.
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Sound produced by a thunderstorm is heard 10s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given speed of sound = 340m s–1.)
A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo? Speed of sound in air is 33m/s.
What will happen in a cell if its nucleus is removed? Give reasons in support of your answer.