Question
State kepler's first law of planetary motion.
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Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
The given graph (Fig.) shows the displacement versus time relation for a disturbance travelling with velocity of 1500m s–1. Calculate the wavelength of the disturbance.

Name the two external factors that have favourable effect on egg-laying of hens.
Write the characteristics symptoms of: