Hi,
I was wondering whether the decay of the Pi-0 meson in QED to an electron positron pair can occur as follows:
Pi-0 -> virtual photon -> e+e-
or does it have to go via
Pi-0 -> two virtual photons -> e+e- (the Feynman diagram has a 'square' of virtual electrons/photons)?
I have...
I'm struggling with the relation between particle exchange and parity with the case of para- and ortho-hydrogen.
The overall wavefunction must be antisymmetric with respect to particle exchange and so for para-hydrogen (an antisymmetric spin state) the spatial part of the wavefunction must be...
Firstly, apologies for the notation.
The 4-momentum of a massive particle (rest mass m) is defined by
p=mu
where u is the 4-velocity. Thus in a frame S in which a particle has 3-velocity u the components of p are
[p]=gamma*(mc,mu)
How can we then identify the zeroth component of...
Homework Statement
A stone is dropped from a stationary helicopter 500m above the ground, at the equator. How far from the point vertically below the helicopter does it land?
Homework Equations
Conversation of AM
The Attempt at a Solution
Let the height above the ground it is...
So, the rocket equation is
F_ext = m(dv/dt) + u(dm/dt)
where m is the mass of the rocket, v the velocity, u the effective exhaust gases speed, and F_ext the external forces on the system.
If we take a constant mass ejection rate p, and take the external force to be the gravitational...
How do you write in scientific notation "the (SI) units of x are..."?
For example, the SI units of time are seconds. Is there any succinct way I can write this? Maybe it's like this:
{time} = s
?
I'm getting confused with different types of acceleration when dealing with rotating systems. There is centripetal acceleration, tangential acceleration, and angular acceleration as far as i know. How do you derive that linear momentum equals angular momentum multiplied by the radius?
And...