School of Physics

Hi,

As high mass stars approach their death to become neutron stars, black holes etc, what direction on the HR diagram do they head and where do they end up resting (relative to the HR diagram because they are obviously not on it anymore)?

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Hi,
If open clusters are considered younger than globular clusters, do open clusters eventually form to become globular clusters? If not, what is the life cycle of open clusters?

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Hi, The CNO cycle to fuse hydrogen to helium only occurs at over 1.6x10^7 K. At this stage the only fusion product is helium... so where is the carbon, nitrogen and oxygen coming from? Also, some texts call C, N and O all catalysts, while others say that only C is a catalyst! I seem to think the lat...

Hi, just in addition to the previous question... Q: The ratio of radii of orbits of two stars in a binary is about 3:5. Use this to estimate the massess of each star. A: Since the ratio of diameters of orbits is 3:5, then ratio of their masses is 5/8 and 3/8. These masses are therefore 5.25x10^30kg ...

Hi, When studying visual binary stars, we use the formula M=(4pi^2R^3)/(GT^2) where T is defined as the period of the "system", with the 2+ stars orbiting a centre point in space. What exactly is this period? What does it look like? How are the stars moving? I've only ever encounted "...

Hi, With twins paradox they say that the person flying at relativistic speeds away from Earth will 'age less' - understandable! But why then, if this person was to watch an event happening on earth, does it appear to go slower then it would in their 'spacecraft'? Don't these contradict each other? T...

Hi, just want to check this: When we say that the movement of a magnet onto a superconductor induces currents in the superconductor which create a magnetic field opposing the magnetic field of the magnet, is it correct to say that the induced currents where solely the product of originally moving th...

Hi,
I understand with n-type semiconductors how there is a free unbonded electron introduced by the group 5 dopant which can easily move under an applied voltage, but with p-type I can't see any reason why electrons (and positive holes) would want to move?

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Maybe I put it the wrong way! Hertz discovered that the major factor (but not the only factor) causing the sparking was the photoelectric effect caused by the UV emission of the inducation coil and transmitting loop. When he blocked this UV there was still a small spark occuring in the receiver loop...

Hi,
In Hertz's original experiment to verify Maxwell's prediction of electromagnetic waves, what is actually 'happening' with the receiver? What is causing it to spark also?

Thanks

Hi, It is said that for a force to be experienced on a charged particle in a magnetic field, the particle must have a velocity: ie by the formula: F = qvBsin@. Why is it that the particle has to have a velocity? In the similar scenario of a electric field, the formula F=qE, the charged particle expe...