Top answers

How does stimulated emission work?

Stimulated emission occurs under the specific circumstances of a population inversion, that is, when there are more electrons in a higher energy level than one below it. There will be a certain energy differ...
KE
Answered by Konrad E. • Physics tutor
6489 Views

How does electromagnetic induction produce a current?

When a wire moves through a magnetic field the wire cuts through the magnetic field lines. This cutting through gives a force on the electrons in the wire, pushing them along, and these moving electrons are ...
KE
Answered by Konrad E. • Physics tutor
4702 Views

What is the cosine rule?

What is it? The cosine rule is a tool to find the size of an angle or the length of a side in a triangle. When to use it? - When we are given 2 sides and an angle- When we are given 3 sides How? For a triang...
NG
Answered by Naomi G. • Maths tutor
5732 Views

What are Oxidation and Reduction?

Oxidation and Reduction forms the basis of Redox reactions - where electrons are exchanged between reactants to form new products. Oxidation is the LOSS of electrons. Eg: Fe 2+ - e - --> Fe 3+ Reduction i...
CL
Answered by Calum L. • Chemistry tutor
6786 Views

Why do energy and biomass decrease at successive stages of the foodchain?

Energy is transferred throughout the food chain as animals at lower trophic levels are consumed by those at higher trophic levels. In every living organism, energy is taken in as food. But when one organism ...
KH
Answered by Katie H. • Biology tutor
60077 Views