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A sample of hydrogen atoms are all in the n = 5 state. If all the atoms return to the ground state, how many different photon energies will be emitted, assuming all possible transitions occur?
If there are 500 atoms in the sample and assuming that from any state all possible downward transitions are equally probable, what is the total number of photons that will be emitted when all the atoms have returned to the ground state?
Four 7.0-kgspheres are located at the corners of a square of side 0.50m. Calculate the magnitude of the gravitational force exerted on one sphere which is in left and down corner of the square by the other three.
A girl is whirling a ball on a string around her head in ahorizontal plane. She wants to let go at precisely the right timeso that the ball will hit a target on the other side of the yard. When should she let go of the string
The intensity of the sunlight that reaches Earth's upper atmosphere is approximately 1465 W/m2. What is the average energy density
A small car with mass 0.690 travels at constant speed on the inside of the track that is a vertical circle with radius 5.00. If the normal force exerted by the track on the car when it is at the top of the track (point) is 6.00, what is the normal fo..
In a coil of resistance 1 the induced current developed by changing magnetic flux through it is shown in figure as a function of time. Find the magnitude of change in flux through the coil in wb?
Assume you are planning a trip in which a spacecraft is to travel at a constant velocity for exactly six months, as measured with a clock on board the spacecraft, and then return home at the same speed. Upon return, the people on earth will have aged..
In a perfectly inelastic collision, two identical 2kg objects collide head to head. What is the total linear momentum after collision
A copper-constantan thermocouple generates a voltage of 4.75 x 10-3 volts when the temperature of the hot junction is 110 °C, what is the temperature in degrees Celsius of the hot junction
a basketball player of height 1.8 m is standing 2.4 m in front of a convex spherical mirror of radius of curvature 4.0
A 2kg vertically hanging object was connected via a pulley (I=20kg sq meter, 0.6 meter diameter) to another 3kg object sitting on a 40-degree smooth incline. Find the angular acceleration of the pulley after the objects moved 5 meters using energy..
A curve of radius 35 m is banked for a design speed of 64 km/h. If the coefficient of static friction is 0.34 (wet pavement), at what range of speeds can a car safely make curve.
the kinetic coefficient of friction for a 12 kg mass on a table is 0.25. a string from this mass goes across a pulley
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