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The electronic energy level of a certain system are given by En = E1*n2, where n = 1, 2, 3. Assume that transitions can occur between all levels. If one wanted to construct a laser from this system by pumping the n = 1 to n = 3 transition, which energy level or levels would have to be metastable?
The Sun emits electromagnetic waves (including light) equally in all directions. The intensity of the waves at the Earth's upper atmosphere is 1.3 kW/m2. At what rate does the Sun emit electromagnetic waves?
A cargo plane is flying horizontally at an altitude of 20.0 km with a speed of 888 km/h when a large crate falls out of the rear loading ramp. How long does it take the crate to hit the ground
q1. when a surface is irradiated with light of wavelength 4950 a a photo current appears that vanishes if a retarding
Explain the difference between a fluorescence emission spectrum and a fluorescence excitation spectrum, What is the force constant for the CO bond
Three uniform meter sticks, each of mass , are placed on the floor as follows: stick 1 lies along the axis from = 0.290 m to = 1.29 m, compute the location of the center of mass of the meter sticks
A reversible power cycle whose thermal efficiency is 40% receives 50 kJ by heat transfer from a hot reservoir at 600 K and rejects energy by heat transfer to a cold reservoir at temperature Tc. Determine the energy rejected in KJ
Suppose a rock is launched straight upward with a speed of 24.83 m/s from the surface of another planet. 2.95 seconds later, the rock has reached apogee. What is the acceleration due to gravity on the surface of that planet?
A boeing 747 "jumbo jet" has a length of 59.7m the runway on which the plane lands intersects another runway. the width of the intersection is 25.0m. the plane decelerates through the intersection at a rate of 5.7 meter per second square and clears i..
When a 9.36 kg block is placed on top of avertical spring, the spring compresses 4.03 cm. Find the force constant of the spring.
Assume you had two small boxes, each containing 1.00g of protons. If one were placed on the moon with an astronaut and the other were left on the earth, and if they were linked by a very light (and very long!) string, and the tension in the string is..
A conventional mercury thermometer consists of a thin glass capillary filled with mercury. The capillary is enclosed in a protective glass cylinder. These mercury thermometer can be quite sensitive and very precise.
What is the magnitude of the magnetic field at the following distances from the central axis of the cable?
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