Recent content by repugno

Is 0 an odd or even number? The reason why I ask is this: I need to write cosh(x) as the sum of an even and odd function. I could only come up with cosh(x) = cosh(x) + 0, where cosh(x) would be the even and 0odd. However, this doesn't make any sense since 0 is exactly divisible by 2 with no...

When we take the modulus squared of the spherical harmonics we loose the term containing the azimuth angle and the imaginary number. Isn't this a problem since we loose information about the shapes?

What is the physical interpretation of the imaginary component in the spherical harmonics? I am under the impression that when we sketch the shapes of the spherical harmonics we exclude the imaginary components.

thanks, things are clearing up now but I'm still not completely satisfied. The derivation of the energy momentum relation was done (according to my uni notes) by originally defining p = mv/sqrt( 1 - v^2/c^2) it follows that E = pc for massless particles and that you can equate this with E = hf...

I got it from the relativistic definition for momentum. p = mv/sqrt(1 - v^2/c^2) and when you put v = c it should become clear where I got it from. I was curious since they use this definition for momentum when they derive the energy momentum relation.

As far as I understand 0/0 = undefined. What does this actually mean? is it somekind of constant? I came across this in the Energy momentum relation where p = 0/0 for a photon, but it can still be stated that E = pc. Thanks in advance

Thanks, it's just occurred to me that I've been looking at the situation the wrong way. :zzz: . problem solved

The book gives the answer very vaguely which confuses me more. It does not have any calculus involved.. k(e + x) - Mg = -Ma I have no Idea how they've derived this Then they say 'in the equilibrium position, the pull of the spring ke is equal to the weight' ke = Mg But when the...

I've been trying this question for quite some time and have given up. Prove that a mass,M , suspended from a fixed point by a helical spring, which obeys hooke's law, undergoes simple harmonic motion when it is displaced vertically from its equilibrium position. Say I displace the mass...

Ahhh, so that is what is meant when the de broglie wavelength is infinite? h/0

Can an electron be at rest?

thanks for the reply. that is not what I'm looking for. I am trying to find a measured wavelength of an electron and if possible the voltage of the power supply accelerating it.

Hello all, I have been searching the web to find experimentally determined values for the wavelength of an electron but have been unable to find the data. Can anyone tell me where I can find such data? (not calculated with de Broglies equation). Thanks

I was wondering exactly what sine is. i know that the relationship between sine and the angle is expressed as sinx=opposite/hypotoneuse. But is sine somekind of constant you multiply the angle with to get the O/H ratio? How did the people calculate the ratios without calculaters when they only...

On a couple of webisites I have seen that they have equated E=mc^2 with E=hf ... i.e hf=mc^2 But how can this be done when E=hf is describing the energy of a photon and E=mc^2 isnt? Also, can someone provide me with a derivation of de Broglie’s theorem ? Wavelength = h/momentum...