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The negative value stems from the definition of gravitiational potential energy which states that it is equal to the work done by the gravitational field moving a body to its given position from infinity. At...

It's important to look at the number of marks awarded for an answer, this can help you structure your answer and think about what will be on the marking scheme. Here a simple statement of an application of r...

A geostationary orbit is one that appears in the same location as seen from an observer on earth. This requires three criteria; It's orbital period must be 24 hours The orbit must be above the equator at aro...

Electromagnetic waves can be imagined by a sinusoidal wave moving up and down, with this movement perpendicular to the direction that they are travelling in. Imagine a sea wave, it moves up and down but also...

Neutrinos are hard to detect because they are 100,000s of times smaller than an electron, so are too small to detect with current equipment. They also dont have a charge and do not interact with any other at...