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  4. 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.

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Q. 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.

Dual Nature of Radiation and Matter

Solution:

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. $\Lambda$ s energy levels are characteristics of glass, glow depends on glass.