Quantum Mechanics Answers

A boy pulls a box of mass 48 kg with a force of 110 N at an angle of 28o above the horizontal. The coefficient of friction between the sled and the surface is 0.32. Determine whether the work done by the applied force.

During an experiment of momentum, trolley, X, of mass (2.34 ± 0.01) kg is moving away from another trolley, Y, of mass (2.561 ± 0.001) kg with a speed of (3.2 ± 0.01) ms -1 . The second trolley, Y, is moving away with a speed of (2.5 ± 0.01) ms-1 . What is the absolute uncertainty of the ratio of momentum of the two trolleys X Y ?

A ladder of length, L = 5 m and mass of 12 kg is leaning against the wall as shown. Static friction μs = 0.48 acts on the foot of the ladder and is placed 3 m away from the wall. How far along the ladder 60 kg person climb above the ground before it starts to slip.

prove it in photoelectric effect the max velocity of photo electrons (V max = 5.93 * 10^5 *(V)^0.5 ) is related with retardation potential.

Three packing crates of masses, M1 = 6 kg, M2 = 2 kg and M3 = 8 kg are connected by a light string of negligible mass that passes over the pulley as shown. Masses M1 and M3 lies on a 30o incline plane which slides down the plane. The coefficient of kinetic friction on the incline plane is 0.28. A. Draw a free body diagram of all the forces acting in the masses M1 and M2. [2 marks] B. Determine the tension in the string that connects M1 and M2.

A typical atomic nucleus is about 5.0 × 10−15𝑚 in radius. Use the

uncertainty principle to place a lower limit on the energy an electron must

have if it is to be part of a nucleus.[ans; 3.3 × 10−12𝐽]

II. A hydrogen atom is 5.3 × 10−11𝑚 in radius. Use the uncertainty principle

The operation that interchange all coordinates of the two particles called

Three packing crates of masses, M1 = 6 kg, M2 = 2 kg

and M3 = 8 kg are connected by a light string of

negligible mass that passes over the pulley as shown.

Masses M1 and M3 lies on a 30o incline plane which

slides down the plane. The coefficient of kinetic friction

on the incline plane is 0.28. Determine the tension in the string that connects m1 and m2

Consider a particle with the general Hamiltonian H and the potential of the Hamiltonian is a delta function. Find the ground state energy? Using a gaussian trial wave function.

Light of frequency 6 × 1014 Hz incident on a metal surface ejects 

photoelectrons with a maximum kinetic energy of 2 × 10–19 J. Calculate 

the work function of the metal, giving your answer in eV.