Recent content by map19

If your electrons are emitted by photons that are spaced by, say, ten a second, then the emitted electrons are also spaced by ten a second. regardless of their velocity the current is 10 electrons/sec.

The only frequency to talk about here is the photon electromagnetic frequency, which is proportional to its energy. The number of photons is the intensity. One photon - one electron knocked loose. A change in photon frequency is a change in energy, not a change in the rate at which photons...

See my previous post. Or, think of it in energy terms. Each photon with energy (E = hf ) that is at or above the metal's work function will spring loose an electron. More photons = more electrons. Work function for most metals is around the same as the energy in visible light photons. eg...

Yes. What applies to matter in general does not always apply to sub-atomic particles. For matter any increase in temp, angular momentum, density, (that is, any energy addition) increases the mass. and thus the the gravitation.

The electric and magnetic field vectors are components of the electromagnetic wave and, in a sense, are locked together as transverse components in the wave. The wave is then propagated as a transverse wave with orthogonal electric and magnetic vectors and c = 1/sqrt(u.e). Thus both field...

The "observable universe" is a vague term. There's our Hubble Sphere, which is the distance from Earth that the recession velocity = c. But red shift, recession, is measured by a factor that is frequency of emitted light divided by frequency of light received here minus 1. It is Z = (f0/fr)-1...

jackmell. Wiki phase transitions. In the early universe just after the BB the phase transitions were essential. for ex. taking the electroweak symmetry and giving us the electromagnetic stuff we have today. last I heard Weinberg was investigating early transitions. I believe whether they are...

handwaving and saying 'infinite energy' is nonsense. As a physicist you know that infinite energy can't exist. no point mentioning it. the conundrum is that could our ship communicate with it's take-off point it would be told that you are up to 99.99c, you are not increasing in speed, your...

"you will never measure a speed greater then c." as seen from other frames. I was careful to say that. You all seem to be missing the point. If locked inside a ship experiencing acceleration you can only rely on acc. x time to calc your speed. What distant observers see is irrelevant to you...

Let's try a practical example. two meteorites collide in space. This collision is observed from 3 different planets. Thus the meteorites have 3 different sets of relative velocities. each planetary observer sees total momentum before the collision equal to total momentum after the collision...

starthaus. You haven't disproved anything. you are referring back to the start point or reference frame because these relativistic formulae always do. If you are inside a ship and it accelerates at a constant rate, eventually, by your own calc of constant speed increase x time you will see...

At speeds we are used to everyday, momentum is a reduction of that formula to p = mv. Normally we only consider v to be in the x direction. v in several axes at once gets very confusing. while momentum is a handy measure for doing calcs of energy distribution it is not in itself very useful...

They can't. The only possibility is the addition of frost stuck to the outside of the cans. The hotter an object is the more it should weigh. The difference is tiny. The reason is that weight relates not just to mass but to the total energy of the object. That is the mass-equivalent energy...

The argument seems to be that a thing without a 'part' can not 'erupt' out of nothing. Also dragging in the red herring that "mathematics says". What happens in mathematics may or may not happen in the real world. Particle pairs can and do appear out of nothing, provided enough energy is...

My rough guide is that stuff you see in the night sky all lit up is about 4% of the mass of the universe, and it's all baryonic. Other baryonic stuff you can't see is cold , like black holes, dark stars, lone planets , asteroids, shrapnel, and gas. About 8%. Then there's hot dark matter -...