Physics
It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because

Centre of gravity falls within the body
Weights of buckets are balanced
Resultant weight of buckets is zero
Centre of gravity and centre of equilibrium fall within the feet

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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?

Both the photons have different energies.
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
The frequency of X-ray photon is higher than the frequency of visible radiation photon.

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