Embibe Experts Solutions for Chapter: Structure of Atom, Exercise 1: COMEDK UGET 2015

In the following sets of ions, which one is not isoelectronic with the rest of the species?

A $150$ watt bulb emits light of wave length $6600 \mathrm{\AA }$ and only $8\%$ of the energy is emitted as light. How many photons are emitted by the bulb per second?

An orbital with $\mathrm{n}=3, \mathrm{l}=1$ is designated as

Energy associated with the first orbit of ${\mathrm{He}}^{+}$ is