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Ruby lases at a wavelength of 555 nm. Acertain ruby crystal has 4.00 multiplied by 1019 Cr ions (which are the atomsthat lase). The lasing transition is between the first excitedstate and the ground state, and the output is a light pulse lasting2.20 μs. As the pulse begins,60.0% of the Cr ions in the first excited state and the rest are inthe ground state. What is the average power emitted during the pulse? (Hint: Don't just ignore the ground-state ions.)
a solid cylinder rolls down an inclined plane without slipping. if the center of the mass of the cylinder has a linear acceleration of 2.67 m/s^2
A 116 g insulated aluminum cup at 15°C is filled with 140 g of water at 50°C. After a few minutes, equilibrium is reached. Estimate the total change in entropy
you put 1kg of water at 1 degree celsius together with 0.5kg of steam at 100 degrees celsius what will the final
An alpha particle (the nucleus of helium nucleus with charge+2e and mass 4.0u ( 1u = 1.66 x 10-27) moves in acircular orbit of radius R=12cm in a uniform magnetic field of0.25T. Where the magnetic field is perpendicular to the plane.
A circular coil of wire with 200 turns and a radius of 30 cm is laying flat on a horizontal wooden table. find the magnitude of the magnetic flux through the coil
Measurements of the radioactivity of a certain isotope tell you that the decay rate decreases from 8305decays per minute to 3080 decays per minute over a period of 5.00 days
In a Hall-effect experiment, a current of 4.0 A sent lengthwise through a conductor 0.8 cm wide, 3.6 cm long, and 9 ?m thick produces a transverse, Find the number density of charge carriers
A proton and an electron are moving due east in a constant electricfield that also points due east. The electric field has amagnitude of 8.0x104 N/C. Determine the magnitude of the acceleration of the proton and the electron.
The radius of our galaxy is 3 *10^20m, How much time would elapse on earth during the traversal
A 2.65 kg mass oscillates back and forth on a spring with a velocity vector that varies as a function of time according to the following v(t)=(3.95cm/s) sin [0.79 rad/s], What is the maximum speed of mass
In order to determine a newly developed material's specific heat conduct, material scientists conduct an experiment. what is the specific heat of the unknown
A nuclear power plant generates 2000 MW of heat energy from nuclear reactions in the reactor's core. determine the possible thermal efficiency of the power plant
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