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What is the Photoelectric effect?

The photoelectric effect is the stimulated emission of electrons from a (generally metallic) material upon irradiation with light of sufficient energy (light of a short enough wavelength). The incident photo...
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Explain what happens in terms of current induced as a magnet enters a solenoid in a closed circuit, and as it leaves.

This is an application to Faraday's and Lenz' laws of electromagnetic induction. So as the magnet moves into the coil, the magnetic field from the magnet moves through the coil, therefore there is a change i...
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Answered by Danruh L. • Physics tutor
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What is the derivative of distance with respect to time.

The derivative of distance with respect to time is velocity.
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Why does a small puddle of water evaporate at room temperature, even though the temperature is way below the boiling point of water?

To understand why the water evaporates, we need to know what we mean when we say something has a certain temperature. Temperature is proportional to the average kinetic energy of the microscopic molecules in...
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Answered by Ellen S. • Physics tutor
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According to Newton's third law, every action has an equal and opposite reaction. Why then does a box move when I push it? Shouldn't the two opposing forces cancel out to a zero net force?

The key to this question is realising that the action and corresponding reaction refer to forces that act on different objects . When I push the box, I exert a force on the box. As a result of this force, th...
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Answered by Ellen S. • Physics tutor
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