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a Hydrogen atom is in the gound state. it absorbs some energy, leaving the atom in an excited state, the atom returns to the ground state by emitting two photons, the first of wavelength 486.1 nm. calculate the wavelength of the second photon, and the total energy initially absorbed by the atom.
When Babe Ruth hit a homer over the 7.5 -high right-field fence 98 from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.4 above the ground and its path initially made a 37 angle with the grou..
A student m = 81 kg runs at a velocity vi = 2.25 m/s before jumping on a skateboard. After jumping on the board the student has a velocity vf = 1.75 m/s. What is the mass of the skateboard in kg
An ideal gas is brought through an isothermal compression process. what are the temperature of the gas and the final pressur
A transverse wave of frequency 14 Hz propagates down a string. Two points 15 cm apart are out of phase by pi/6. What is the wave velocity
An RC circuit has a resistance of 20 mega ohms and time constant of 100 sec. If the capacitor charged to a voltage of 10v, what is the charge in coulombs on its plate
A contestant on "Survivor" is challenged to find buried treasure in a featureless desert. For how long should she run in order to retrieve the treasure
Two parallel slits are illuminated by light composed of two wavelengths. One wavelength is ?A = 630nm. The other wavelength is ?B and is unknown. What is the unknown wavelength
A Ferris wheel is moving at an initial angular velocity of 1.0 rev/48 s. If the operator then brings it to a stop in 3.4 min, what is the angular acceleration of the Ferris wheel
q1. a stone has a mass of 5 x 10-4 kg and is wedged into the tread of an automobile tire as drawing shows. the
When a potential difference of 160 V is applied to the plates of a parallel-plate capacitor, What is the spacing between the plates
The small skydiver, weighing 50N, sinks 1.0m into the snow when her parachute does not open, Determine the work done by the snow in stopping the person
Having taken a nap under a tree only 20 m from the finish line, Rabbit wakes up to find Turtle 19.5 m beyond him, grinding along at 1/4 m/s. How many seconds will he win or lose by
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