Physics Answers

Compute the expectation value of ,  operators for a pparticle in general state  where A and  are real physics constants,  and  represents the position and momentum operator. What is the value of A in terms of .

For the 2P → 1S transition in the hydrogen atom calculate ω. Assuming the 

spontaneous emission lifetime of the 2P state to be 1.6 ns, calculate the Einstein B 

coefficient. Assume n0 ≈1.

an object thrown up with a instant velocity 40m/s from grounds. assume the energy is conservative. find

a) maximum height

b)when where does Porential energy= Kinetic Energy if mass m=2kg

a circuit in which a capacitor of capacitance 4700microfarad is to be connected across a potential difference of 9v.He has 4700microfarad 6v capacitor available. draw the diagram to show how the 4 capacitor could be used for this purpose

Consider a wavelength multiplexer made from

circulators and fiber Bragg gratings. Assume the

input optical power of each wavelength is through

24 is 1 mW. Let both the insertion loss and the

throughput loss of each FBG be 0.25 dB, and let the

insertion loss of a circulator be 0.6 dB. What is the

power level of each wavelength in through h4

emerging from the final circulator ?

A car with mass = 1000 kg is traveling at a velocity of 100 m/s. What’s the car’s momentum?

i ) Describe any 4 natural/ industrial processes of adiabatic compression and

adiabatic expansion.

ii ) State how entropy changes are linked with Air pollution in modern world.

iii ) Describe the difference between capacitor and a capacitance. Also state the basic relation between frequency and capacitance.

Scooby Doo is initially at rest when he sees a box of Scooby Snacks 55 m up ahead. If Scooby Doo accelerates at 0.44 m/s2, how long does it take him to reach the box of Scooby Snacks? 

During a promotional stunt, Krusty the Clown stands on the roof of the Krusty Burger Restaurant and drops burgers down toward the hungry crowd below. One of the burgers is caught by Homer Simpson when its velocity is 12.50 m/s [D]. Calculate the burger’s displacement. 

A basketball spinning on someone’s finger undergoes an angular acceleration of - 0.15 rad/s and is traveling at 27 rad/s initially. How many revolutions will it make before coming to a stop?