Physics
In very cold countries alcohol is used as a thermometric liquid because

Alcohol can be coloured for its level to be seen easily
Alcohol is a poor conductor of heat
It will not stick to the glass tube
Its freezing point is very low

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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 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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