Describe how emission spectra are formed and how they can be used to identify the elemental composition of a star.

Electrons are bound to a nucleus in quantised energy levels. As they gain and lose energy they transition between this energy levels by emitting photons. Emitted photons have energies equal to the change in energy of the electron due to the conservation of energy. Since every different element's nucleus has different energy levels, they emit photons of specific energies and wavelengths, providing a unique spectrum of light. By comparing the frequencies of light emitted by stars to known frequencies emitted by elements found experimentally on Earth, the elements present in stars can then be identified.

GP
Answered by George P. Physics tutor

2452 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

Initially, trucks A and B are travelling in opposite directions. A has mass 1000 kg and is travelling at speed 7ms^-1. B has mass 4000kg and is travelling at speed 2ms^-1. What is their speed and direction after collision if they move together?


How do I derive equations for Time of Flight and Range in Parabolic Motion?


Explain the difference between the direction of the conventional current and the direction of electron flow.


Describe and explain the life cycle of a star?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences