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when we shine light on a metallic surface to eject electrons out of it, why is...

when we shine light on a metallic surface to eject electrons out of it, why is it that the electrons don't eject out if we increase the intensity of the light but ejects only when we increase the frequency?
This was true in the early 1900s but later in the future sophisticated machines came and they could really crank up the intensity of light into a great magnitude and then the electrons did eject. Please explain me how?

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