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The photoelectric effect is a phenomenom which occurs when photons strike a metal causing electrons to be released from the metal atoms. This occurs because the photons transfer their energy to the ele...

Isotopes of an element exist when the atoms of an element have different numbers of neutrons, or in other words the same atomic number but a different mass number.

Speed is how fast an object is moving, whereas velocity is an objects speed in a given direction.

The SUVAT equations are used when acceleration is constant and velocity is changing. If speed is constant, you can use the speed, distance and time triangle. They can be used to work out initial and fi...