Question
What is an echo? Write the conditions to hear an echo.
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| Name of compound | Type of compound |
| a) Sodium chloride | ? |
| b) ? | co-ordinate covalent compound |
| c) Methane | ? |
| d) Fluorine molecule | ? |
An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 m and 20 s?