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What is the definition of the photoelectric effect?

The photoelectric effect is the emission of electrons from the surface of a metal due to exposure of electromagnetic radiation above a certain frequency. Photon energy (E=hf or E=hc/λ). The work function is ...
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Answered by Chris D. • Physics tutor
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Explain the process of annihilation?

Matter and antimatter will annihilate if they meet: 1) Particle meets antiparticle. 2) Both have rest energies due to their masses. 3) Both have kinetic energies due to their movement (if they are moving). 4...
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Answered by Chris D. • Physics tutor
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What is the Strong Nuclear Force?

The Strong Nuclear Force keeps protons and neutrons together in the nucleus.Its range is no more than about 3-4 fentometres. It has equal effects between a proton-neutron, neutron-neutron and proton-proton c...
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Answered by Chris D. • Physics tutor
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Why the Newton's second law of motion important?

Newton's Second Law of Motion F=ma is very important because it shows the relationship between forces and motion. It allows you to calculate the acceleration (and therefore velocity and position) of an objec...
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Answered by Saeed G. • Physics tutor
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A stationary observer Bob, observes Alice take 5 seconds to travel from point A to B at 0.95c. How much time does Alice measure the journey from A to B to take?

This question is all about the application of Special Relativity. In order to solve this problem we need to identify that the correct equation to use here is:t= (gamma factor)t 0 Where t is the time observed...
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Answered by Elizabeth R. • Physics tutor
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