ChemistryJEE Main 23 Jan 2026, Shift 2·Q14·MCQ·Easy–moderate

Structure of Atom · Atomic notation and photon energy

Identify the INCORRECT statements from the following:

(A)Notation $\ce{^{24}_{12}Mg}$ represents 24 protons and 12 neutrons.
(B)Wavelength of a radiation of frequency $4.5\times10^{15}$ s $^{-1}$ is $6.7\times10^{-8}$ m.
(C)One radiation has wavelength $= \lambda_1$ (900 nm) and energy $= E_1$ . Other radiation has wavelength $= \lambda_2$ (300 nm) and energy $= E_2$ . $E_1 : E_2 = 3 : 1$ .
(D)Number of photons of light of wavelength 2000 pm that provides 1 J of energy is $1.006\times10^{16}$ .

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