Quantum Mechanics Answers

If two operator do not commute what does it mean

If a parallel beam of light of energy density U falls normally on an object and totally absorbed what is the pressure exerted on body

A photocell in the saturation mode is irradiated
by light of wavelength  = 6600 Å. The
corresponding spectral sensitivity of the cell is
s = 4.8 mA/W. Find the yield of
photoelectrons, i.e. the number of
photoelectrons produced by each incident
photon. [Take : h = 6.6 × 10–34 J-s]

A station emits wave of wavelength, Lamda at P. If the planck's constant is (h=6.63×10^-34 js) and the speed of light is (C=3×10^8 ms-1), what's the rate of emission of photon

A station emits 96MHz frequency at the rate of 100KW. Calculate the number of photons emitted per second.

Calculate the probability that the electron in the ground state of hydrogen will be found outside the Bohr radius.

Given the radial probability density function for the hydrogen atom in its ground state,

P_1s (r)=((4r^2)/(a_0^3 )) e^(-(-2r)⁄a_0 )

What is Heisenberg uncertainty principle, and how does it work for position and momentum measurements?

The relativistic momentum of a neutron(rest mass energy=940 MeV)whose kinetic energy k=200 MeV is given by

The ground state wave function of a particle in a 3D potential is given by ¥=Ae^{ar^3}, where A is the normalisation constant. The value of A is given by

A projectile is thrown at an angle theta Such that it is just able to cross a vertical wall at heighest point of journey the angle theta at which the projectile is thrown is given by?