An electron falling from one energy level to another emits a photon of wavelength 550nm. What is the difference between the two energy levels?

The key equation is that of the energy of a photon.

E = hc/λ​ 

Using λ​ = 550nm gives E = 3.61x10^-19J (Remember that a nanometer is 1x10^-9 m).

Using the conservation of energy, the energy of this photon must be the energy lost by the electron.

Hence, the energy gap E = 3.61x10^-19J 

Answered by Jamie L. Physics tutor

2341 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

What is the Quark structure, Baryon number, and antiparticle of a kaon, K+, which has a strangeness of 1.


Explain the gaps within an absorption spectrum and where this may commonly occur in the universe


Describe and explain the photoelectric effect (6 marks)


how do you calculate the charge of a neuclues compared to an ion?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences