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  4. A positively charged zinc plate is connected to an electroscope. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/a72110696b7c477a11cebc5c1a10992e-.png /> It is then irradiated by UV-light. Result is

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Q. A positively charged zinc plate is connected to an electroscope.
image
It is then irradiated by UV-light. Result is

Dual Nature of Radiation and Matter

Solution:

Positive charge on a positively charged zinc plate was found to be further enhanced when it was illuminated by ultraviolet light. So, leaves of electroscope will move further apart.