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The semiconducting compound ZnS is widely used for ultraviolet light emitting diodes (LED's). The energy gap in ZnS is 3.6 eV. What is the frequency of light emitted by a ZnS LED?
The average depth of Earth's oceans is 2.236 mi. Suppose 68% of the earth is covered in water and that the population of the earth is 6.33 billion. (a) How much water mass on the surface of earth is there per person and (b) to help visualize it, w..
A particle with a charge of ? 5.00nC is moving in a uniform magnetic field of B? =?( 1.23T )k^, Calculate the x component of the velocity of the particle
If a person radiates about 67 W of power at room temperature, how long does it take for a person to radiate away the energy acquired by consuming a 260 Calorie donut?
A hydraulic lift has pistons with areas 0.40m2 and 5.95m2 , and they're at the same height. how much mass can the larger piston support
A Carnot engine operates between reservoirs at 550K and 300K, discarding 1500 J of heat in each cycle. determine the engine's efficiency
A loop of diameter d = 10 cm, carrying a current I = 0.2 A is placed inside a magnetic field = 0.3 T. Calculate the magnitude of the torque on the loop
Two long, parallel conductors carry currents I1 = 3.10 A and I2 = 5.10 A, both directed into the plane of the computer screen. Find out the magnitude and direction of the resultant magnetic field at a point midway between the wires. (b) Find out the ..
A gymnast of mass 62.0 hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch.
express what would be the frequency of vibrations.
You throw a ball vertically upward so that it leaves the ground with velocity 6.05 m/s. (a) What is its velocity and direction when it reaches its maximum altitude? magnitude m/s
A 13cm -diameter cylinder contains argon gas at 10 atm pressure and a temperature of 60?C. What is the final length of the cylinder
A star is moving away from the Earth at the speed of 200 km/s. What will be the wavelength of a spectral line that would have the wavelength of 500 nm if the star were at rest.
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