Physics
What is the wavelength of visible spectrum ?

7800 A° – 8000 A°
8500 A° – 9800 A°
3900 A° – 7600 A°
1300 A°–3000 A°

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Physics
The wall of a dam is broader at the base

To withstand pressure that increases in a horizontal plane
Because streamlining is required
To withstand pressure that is increased with atmospheric pressure
To withstand pressure that increases with depth

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