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

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts works as good conductor
Air layer between two shirts behaves like insulating media
No radiation of heat takes place

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