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Describe how a PET scan works?

A PET scan which is known as Positron Emission Topography involves passing a positron emitting source through a patient. The source used for a PET scan is FDG which contains Fluorine-18. A positron emitted b...
AS
Answered by Arjun S. • Physics tutor
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Describe and explain the photoelectric effect in terms of photons interacting with the surface of a metal.

The photoelectric effect occurs when individual photons are incident on a clean metal surface. The photons are absorbed by electrons in the clean metal surface and they are released as photoelectrons. The in...
AS
Answered by Arjun S. • Physics tutor
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Describe and explain the life cycle of a star?

A star begins its life from Hydrogen gas. Gas particles of Hydrogen gas are brought together due to the gravitational force of attraction between them. There is an increase in Kinetic Energy of these gas par...
AS
Answered by Arjun S. • Physics tutor
3621 Views

Given a graph of the displacement of a particle, how can you tell if it is in Simple Harmonic Motion?

There are two main features if an object is in SHM. The first is that it has a fixed maximum amplitude. That is to say, if the mean (halfway between the maximum values of oscillation (+ve and -ve)) displacem...
JT
Answered by Johnny T. • Physics tutor
3247 Views

One of the decays of potassium (A=40, Z=19) results in an excited argon atom with excess energy of 1.50 Mev. In order to be stable, it emits a gamma photon. What frequency and wavelength has this gamma photon?

The nucleus of the atoms are usually in excited states after performing a beta decay. By emitting a photon, the nucleus recover stability. The emitted photon has the same energy as the excess energy of the e...
MS
Answered by Marcos S. • Physics tutor
4050 Views