Question
Mention two characteristic features of phylum Echinodermata.
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The speed of light in water is 2.25 × 108 ms–1. If the speed of light in vacuum is 3 × 108 ms–1, calculate the refractive index of water.
A block of wood of weight 200 g floats on the surface of water. If the volume of block is 300 cm3 , calculate the upthrust due to water.