Among the following photosensitive substances, the one which emits electrons whenit is illuminated by visible light is(A) magnesium(B) zinc(C) sodium(D) cadmium(E) platinum
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Answer:
Sodium
Explanation:
However, some alkali metals such as lithium, sodium, potassium, caesium and rubidium were sensitive even to visible light. All these photosensitive substances emit electrons when they are illuminated by light. After the discovery of electrons, these electrons were termed as photoelectrons.
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