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Why is the spin quantum number of an electron either -1/2 or 1/2 and not other values. Please support via the use of mathematics if possible. Infinite thanks.

If 165.7 MJ/mol photon strike atoms of an unknown element and eject electrons with kinetic energies of 25.4 MJ/mol, what is the workfunction of the element? 

What is the frequency of light attributed to the n=3 line in the Balmer transition (n=2) of hydrogen emission


Write four factors that enable scientists to provide electron coordinates (label completely an electron( in any orbital in any atom 


What is energy of harmonic oscillator.
What is proprties of pauli matrices.
A 20 Kg block rest on horizontal frictionless surface. a constant force of 50 N is applied for 3 seconds. What is the impulse acting on the block? What is the final speed of the block?
Photocell can be used to charge capacitors as shown in the Figure 3, where a diode is placed
to prevent the capacitor from discharging. You were given FOUR new 10.00 mF capacitors. By
using all the capacitors given, how would you arrange the capacitors so that the total
capacitance of the combination can be fully charged by 25.00 hours? Sketch your answer in
the dotted area of the circuit.
The ground state of an oscillator is 10 meV. How much energy is
needed to excite this oscillator to the first excited state? If this oscillator is in thermal
equilibrium at 300 K, calculate the energy of the system
write down degeneracy for isotropic 2 d harmonic oscillator.
write down degeneracy for isotropic 1 d harmonic oscillator.
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