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Problem: What is the energy of an incident photon that is just enough to excite a hydrogen atom from its ground state to its n = 4 state?
I known the correct answer but I need to know how to get that. Thanks!
A rock is kicked horizontally at a speed of 10 m/s from the egde of a cliff. How long is the rock in the air
Two circular coils of current-carrying wire have the same magnetic moment. The first coil has a radius of 0.091 m, 120 turns, and carries a current of 3.3 A. The second coil has 170 turns and carries a current of 9.1 A. What is the radius of the seco..
In San Francisco a very simple technique is used to turn around a cable car when it reaches the end of its route. The car rolls onto a turntable, what is the magnitude of the net torque applied to the car
You have designed a rocket to be used to sample the local atmosphere for pollution. It is fired vertically with a constant upward acceleration of 18 m/s2. Determine the total time the rocket is in the air
11.0 of aluminum at and 22.0 of copper are dropped into 49.0 of ethyl alcohol at . The temperature quickly comes to 25.0. What was the initial temperature of the copper
A 10.4 m long steel beam is accidentally dropped by a construction crane from a height of 8.67 m. What is the induced EMF in the beam just before impact with the Earth
An elevator is moving upward at a constant speed of 2.50 m/s. A bolt in the elevator ceiling 3.00 mabove the elevator floor works loose and falls. How long does it take for the bolt to fall to the elevator floor
In a paramagnet with spin-1 dipoles, each dipole can take on 3 stages: -1, 0 and +1, relative to the direction of the magnetic field, Derive an expression for the partition function for this dipole
A human eyeball is about 2.1 long, and the pupil has a maximum diameter of about 7.5 . What is the "speed" of this lens
a 10 kg box is pushed along a frictionless horizontal surface by a horizontal force of 50n. if the box starts from rest
In Millikan's experiment, an oil drop of radius 1.85 μm and density 0.852 g/cm3 is suspended in chamber C whilst a downward electric field of 0.62 × 10^5 N/C is applied. Find the charge on the drop, in terms of e.
A rifle with a weight of 20 N fires a 4.0-g bullet with a speed of 210 m/s. Find the recoil speed of the rifle
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