Question

The line spectrum is noticed during the transition of an electron from higher excited state to lower one in $H-$atom only when an electron falls from:

• A. $2s$-orbital to $1s$-orbital
• B. $2p$-orbital to $1s$-orbital
• C. $3s$-orbital to $2p$-orbital
• D. $4p$-orbital to $2p$-orbital

Answer 1

Answer: (A)

$2s$-orbital to $1s$-orbital

The line spectrum is noticed during the transition of an electron from higher excited state to lower one in $H$ atom only when an electron falls from $2s-$orbital to $1s-$orbital.