Question
Name any two objects which are good reflectors of sound.
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| Ion | Valency(Charges) | Ion | Valency(Charge) |
| Sodium ion | 1+ | Bromide ion | 1- |
| Ammonium ion | 1+ | Hydroxide ion | 1- |
| Calcium ion | 2+ | Sulphate ion | 2- |
| Lead ion | 2+ | Phosphate ion | 3- |


Give one example each of a body possessing: (i) kinetic energy, and (ii) potential energy.