Physics
Heavy water is used in nuclear reactor to

Absorb neutron
Increase speed of neutron
Slow down neutron
Increase temperature

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Physics
Solids have definite shapes.This is because

The forces of adhesion are large
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are less
The forces of cohesion are very large

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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 speeds of both the photons in vacuum are different
The wavelength of X-ray photon is less than the wavelength of visible radiation photon.

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