Question
Define ‘molecular mass’ of a substance.
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| | A | B |
| Protons | 18 | 20 |
| Neutrons | 22 | 20 |
Which tissue forms blubber of whale and hump of camel?
The frequency of the sound emitted by the lioudspeaker is 1020Hz. Calculate the wavelength of the sound wave in air in cm where its velocity is 340m/s.