Physics
In case of uniform circular motion, the acceleration is

Zero
Variable in magnitude but tangential to the circle
Constant in magnitude and directed radially inwards
Variable in magnitude but constant in direction

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

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