Which of the following substance give off visible light when excited in an electric discharge tube? (i) Helium (ii) Neon (iii) Sodium (iv) Mercury
A
`(i),(ii),(iii),(iv)`
B
`(iii),(iv)`
C
`(ii),(iii)`
D
`(ii),(iii),(iv)`
Text Solution
Verified by Experts
The correct Answer is:
A
Two types of lemp used in streel lights reys on atomic emission. The mercury lamp and the sodium lamp and the sodium lamp. In both cases, light is generated by the electron bombardment of either mercury or sodium vapon. The visible portion of mercury emission falls mainly in the yellow, green, and purple regions, and sodium emission is centerted mainly in the yellow region.
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