Quantum Mechanics Answers

If the incident photon has the wavelength eual to 2 Angstrom and it's angle of deflection is 90 degree, the kinetic energy of the recoil electron in the compton scattering ould be?

The de broglie wavelength, associated ith a neutron at teprature 27 degree celcius, is equals to? Also please tell me that i have seen some formulas of thermal wavelenth (in termas of 3mkT, 2mkT, mkT). which one is correct. i am confuse to use them.

The energy density of states of an electron in a one diamensionalpotential well of infinitely high walls is? (No need to do the whole calculation, i know all the formulas of energy and wave function for it. just show me only for the energy density)

A rope extends between two poles. a 90-N boy hangs from it as shown in the figure. find the tension in the two parts of the rope. [Answer in newton)

A 1 hp motor rotates 1200 rpm.How much torque can it exert?

Consider a hydrogen atom in the 2p state. Determine at what radius will the electron probability be a maximum.

For the infinite square well potential, calculate the probability that a particle in its second excited state is in each third of the one-dimensional box:
0≪x≪L/3, L/3≪x≪2L/3,2L/3≪x≪L,
Check to see that the sum of the probabilities is one.

quantum simple harmonic oscillator consisting of an electron under the influence of an restoring force was found to make a transition from n=2 state to n=3 state after absorbing a photon of wavelength 550 nm. Find the proportionality constant k for the oscillator. Mass of an electron =9.1x10-31 Kg; Planck’s constant=6.63x10-34 Js; speed of light in vacuum=3.0x108 m/s

A pendulum is made byattaching a ball of mass m=0.2kg to the end of a massless string. The ball is swung out until it is at a height h=0.2 m above the ground and then is released from rest. When the ball is at the lowest point in the swing, it collides with a ball of mass M=0.4kg originally at rest and sticksto it. The combined masses swing together to the right and rise to a maximum height H. Assume that there is negligible friction.
(a) What is the speed of the ball with mass m just before it strikes the second ball resting on the ground?
(b) What is the speed of the combined masses right after the collision?
(c) Calculatethe maximum height H reached by the combined masses.