Physics
The wall of a dam is broader at the base

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

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Physics
A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct?

The wavelength of X-ray photon is less than the wavelength of visible radiation photon.
The speeds of both the photons in vacuum are different
Both the photons have different energies.
The frequency of X-ray photon is higher than the frequency of visible radiation photon.

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