A nagatively charge electroscope with zinc disc discharge when irradiated by an ultraviolet lamp. What caused this ?A. `a` - particle from the source combine with electron of the discB. electron escape from the disc when ultraviolet radiation fall on it,C. ultraviolet rays ionize the air surrounding the electroscopD. the disc becomes hot and thermionic emission take palce

A nagatively charge electroscope with zinc disc discharge when irradia

1.	A nagatively charge electroscope with zinc disc discharge when irradiated by an ultraviolet lamp. What caused this ?A. `a` - particle from the source combine with electron of the discB. electron escape from the disc when ultraviolet radiation fall on it,C. ultraviolet rays ionize the air surrounding the electroscopD. the disc becomes hot and thermionic emission take palce
Answer» Correct Answer - B

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