Physics
Which among the following waves is used for communication by artificial satellites ?

M.
Radio waves
Micro waves
Frequency of 1016 series

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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 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.

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Physics
A dynamo is a device which

Converts electrical energy into mechanical energy
Creates mechanical energy
Converts mechanical energy into electrical energy
Creates electrical energy

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