Physics
Which of the following parts of the sunlight makes the solar cooker hot ?

Cosmic rays
Ultra violet
Infra red
Red 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 speeds of both the photons in vacuum are different
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.
Both the photons have different energies.

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Physics
What is a neuron ?

The anti-particle of neutron
Particle released during radioactivity
Basic unit of energy
Basic unit of nervous system

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