Physics
The Hooke's law is valid for

Elastic as well as plastic region of the stress strain curve
Only proportional region of the stress strain curve
Entire elastic region of the stress strain curve
Entire stress strain curve

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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.
Both the photons have different energies.
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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