Top answers

An isotope of 238,92-Uranium decays into a stable isotope of 206,82-Lead through a series of alpha and beta decays, how many of each does it go through?

This is a good example of where simplification can make an otherwise tricky question a lot easier. It is easy to get confused trying to work out different isotopes and the extra products of the decays, but a...
NM
Answered by Nathan M. • Physics tutor
6041 Views

Which are the types of carrier movements and how are they activated

Drift - As a result of an electric field Diffusion - As a result of a carrier gradient, by other words a difference in the carrier level from one side to the other, usually when we have a p-n junction
JA
Answered by Joao A. • Physics tutor
2477 Views

How, given the threshold frequency and the kinectic enery of a photon, do you determine the frequency of the phton?

You can use E= hf o + KE and E=hf (Einstien's equations) to work how the frequency of a photon, where f o is the threshold frequency and h is Planck's constant.
HW
Answered by Hermione W. • Physics tutor
2437 Views

A ball is thrown up with an initial velocity of 8 m/s and initial height of 1.5m above the ground. Calculate the maximum height the ball reaches and the time it takes to get there.

Travelling upwards u = 8m/s v = 0 m/s a = -9.8m/s S = ? t = ? v = u + at v 2 = u 2 + 2a(S - 1.5) 0 = 8 -9.8t 0 = 64 + 2*(-9.8)*(S - 1.5) 9.8t = 8 19.6*(S - 1.5) = 64 t = 0.816s (3.sf) S - 1.5 = 3.265m S = 4....
ES
Answered by Evan S. • Physics tutor
7557 Views

Discuss the difference between sharpness and contrast in x-ray imaging

Sharpness describes how well the edges of structures in an x-ray image are defined, while contrast describes the difference in degree of blackening of adjacent structures.
TM
Answered by Tomas M. • Physics tutor
15756 Views