The figure below shows ultraviolet radiation striking polished zinc plates placed on negatively and positively charged gold leaf electroscopes respectively. Explain why the leaf collapses in figure...

      

The figure below shows ultraviolet radiation striking polished zinc plates placed on negatively and positively charged gold
leaf electroscopes respectively.
53120191150.png
Explain why the leaf collapses in figure (a) but does not collapse in figure (b).

  

Answers


sharon
U.V light dislodges electrons from zinc plate.Electrons are repelled by the negatively charged electroscope.This lowers the excess charge on leaf leading to collapse.In figure (b) UV light dislodges electrons from zinc plate positively charged electroscope will re-attract the electrons are kept keeps the charge constant.
sharon kalunda answered the question on May 31, 2019 at 08:52


Next: The diagram below shows a micrometer screw gauge used by a student to measure the thickness of a wire. If it has a zero error...
Previous: The figure below shows an object placed infront of a thin lens. The focal length of the lens is 10cm. The screen is adjusted until an...

View More Physics Questions and Answers | Return to Questions Index


Exams With Marking Schemes

Related Questions