Physics
Water is not suitable as a calorimetric substance because it :

Is a good conductor
Low latent heat of vapourization
Has high boiling point
Has high specific heat

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Physics
Why does the sea appear blue in colour?

Reflection of the sun light from water surface
Scattering of the sunlight by water molecules
Interference of the sun light from water surface
Refraction of the sun light

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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.
Both the photons have different energies.
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

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