MCQ
The element which was observed in solar spectrum is:
- ✓Helium
- BXenon
- CNeon
- DArgon
Pierre Janssen discovered the gaseous nature of the solar chromosphere and with some justification the element helium.
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$(A)$ $500\ \,Hz$ $(B)$ $2\ \ ,Hz$ $(C)$ $250\ \,Hz$ $(D)$ $498\ \ ,Hz$ $(E)$ $502\ \ ,Hz$
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