भृंगों को पकड़ने के लिए डार्विन ने कौन -से तरीके ढूँढ निकाले ?
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The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. ... An alteration in the intensity of light would theoretically change the kinetic energy of the emitted electrons, with sufficiently dim light resulting in a delayed emission.
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