Problem related to electron energy
what is the probability that an electron energy state in Ge will be occupied at temperature T=300 K if the energy state is greater than the Fermi energy by 2 eV? Repeat the calculations for T=77 K.
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A 300 g block on a 54 -long string swings in a circle on a horizontal, frictionless table at 75. What is the speed of the block? What is the tension in the string?
A man pushes a lawn mower on a level lawn with a force of 200 N. If 42% of the force is directed horizontally, how much work is done by the man in pushing the mower 4.8 m?
A 75.0kg man is riding in a shopping mall. The escalator moves the man at constant velocity from ground level to the floor above, a vertical height of 4.60m. What is the work done on the man by the gravitational force and the escalator?
A beam of alpha particles produced a current of 10^-14 A in a parallel-plate ionization chamber for 8 s. The chamber contained air at STP (36 ev ip^-1). If the chamber volume was 240 cm^3, what was the energy absorbed per unit mass in the chamber
Speedboat A negotiates a curve whose radius is 160 m. Speedboat B negotiates a curve whose radius is 180 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of the boats?
What is the minimum current in the rod that will cause it to float in a horizontal magnetic field of 1.70972 T?
What is the magnitude of the normal force exerted on the car by the walls of the cylinder at point A (at the bottom of the vertical circle)?
A staging that weighs 430 N supports two painters, one 110 N and the other 460 N. The reading in the left scale is Ft = 700 N. What is the reading Fr, in the right hand scale?
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