Physics
Fiber optics cable used in communication, works on the principle of

Diffuse reflection of light
Refraction of light
Regular reflection of light
Total internal reflection of 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 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.
The wavelength of X-ray photon is less than the wavelength of visible radiation photon.

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