357565
Assertion : Cathode rays produce fluorescence in glass and colour of glow depends on nature of glass. Reason : Cathode rays excite glass electrons and they on de-excitation emits radiation in visible region.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Cathode ray particles when strike the electrons of glass atom, the electrons of glass atom are excited and move to higher energy levels. On de-excitation, they fall to their ground state and release energy. As energy levels are characteristics of glass, glow depends on glass. So option (1) is correct.
