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 frequency of X-ray photon is higher than the frequency of visible radiation photon.
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

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

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

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