Physics
Thermohaline circulation is mainly due to

Cold, dense ocean water sinking and warmer water replacing it
Warm water being added to the ocean due to industial waste
Winds causing circulation of ocean water
Warmer, less dense water sinking in the ocean and cold water replacing it

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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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