Question
Which of the following phenomena cannot be explained by
the wave theory of light?Solution
The photoelectric effect cannot be explained by the wave theory of light. The wave theory fails to account for the observation that light, below a certain frequency, does not eject electrons from a metal surface, regardless of its intensity. The phenomenon is explained by Einstein using the particle nature of light, which is described by the quantum theory.
Who among the following was the minister who helped King Ashoka acquire the throne?Â
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Gomti river originates from which of the following states?
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 Why was the National Investment and Infrastructure Fund (NIIF) created?
