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1. Which one of the following statements regarding photo-emission of electrons is correct?
(A): Electrons are emitted when the wavelength of the incident light is above a certain threshold
(B): Kinetic energy of electrons increases with the intensity of incident light
(C): Photoelectric emission is instantaneous with the incidence of light
(D): Photoelectrons are emitted whenever a gas is irradiated with ultraviolet light
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