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How do we know the energy of a photon (light particle) is quantised?

Firstly, quantisation of energy means that energy can only exist for specific, discrete values, i.e. it is not continuous. Now, photons display this phenomena however it is not immediately obvious why, as in...
BM
Answered by Ben M. • Physics tutor
3335 Views

Discuss how X-rays and Ultrasound can be used for medical purposes, including their advantages and disadvantages.

Uses for x-rays: Detecting broken bones, Cancer treatment, CT scans._ Uses for Ultrasound: Pre-natal scanning, Destruction of kidney stones/plaque on teeth, Internal imaging of body parts._ Advantages of X-r...
IF
Answered by Isaac F. • Physics tutor
10284 Views

Can an author use a particular contemporary issue or a precise historical context as a means to convey a more timeless and universal matter?

Like all artists, authors are influenced by the events of their time and era. While Fitzgerald's The Great Gatsby was greatly inspired by the roaring twenties' historical context, Kipling's works captured th...
JS
4729 Views

Solve for x: 2x^2 + 2x -24 = 0

The general formula of a quadratic is ax^2 + bx + c -> this is a quadratic 2) Factorise using common factor (=2) -> 2(x^2 + x - 12) = 0 3) Factorise the quadratic to (x + m)(x + n): the two numbers (m ...
YZ
Answered by Yige Z. • Maths tutor
11543 Views

Briefly describe the mechanism of muscle contraction.

In muscle, myosin protein has 'heads' that act as cross-bridges as they bind to actin, another protein. When ATP binds to myosin, its head detaches from actin, swings forward and rebinds. Rebinding releases ...
HG
Answered by Hester G. • Biology tutor
10321 Views