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

2590 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

The electric potential energy of two protons is 1.0MeV. Calculate their separation


How am I going to remember all of the particles I need to know? (A-level Physics)


A car is travelling at 20 m/s. The accelerator is applied, causing an acceleration of 2m/s^s. How fast is the car travelling after 10 seconds of acceleration?


A 80kg man is hanging from two 1.5m ropes that lie at 60 degrees from the horizontal. What is the tension in each rope required to prevent the man from dropping?


We're here to help

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

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences