railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Physics Wave

In 1859, with which physicist did Robert Wilhelm Bunsen invent flame spectroscopy, an instrument that allows elements to be identified by their emission spectra?

1
William Hyde Wollaston 
2
JBL Foucault 
3
Gustav Robert Kirchhoff 
4
Johann Balmer 
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