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The ground (n=1) state of hydrogen atom is acutally 2 different quantum states with slightly different energies. Because of a magnetic interaction between the proton and electron, the quantum state where the proton and electron spins are aligned has an energy a few microelectronvolts above the energy of the state where the spins are anti-alligned.
A) If the hydrogen atoms undergoes a transition between these states, it emits a photon with a characteristic wavelength of 21 cm. (astronomers can detect such photons with a radio telescope and thus determine the distribution of hydrogen gas in the sky). What is the energy difference between the 2 states.
B) if a hydrgen cloud in intergalactive space has a temperature of about 2.9K (about equal to the temerature of the cosmic background radiation). about what fraction of hydrogen atoms in the N=1 level will be in the aligned state( and thus be capable of emitting the 21-cm photons)?
A 100-m-long train accelerates uniformly from rest. If the front of the train passes a railway worker 166-m down the track at a speed of 21 m/s, what will be the speed of the last car as it passes the worker.
A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 16.0 cm, find electric feild just outside paint layer
A pulley system has an efficiency of 87.5 percent. How much of the rope must be pulled in if a force of 648 N is is needed to lfit a 150kg desk 2.46m .
IP An rms voltage of 12.5V with a frequency of 1.10kHz is applied to a 0.375?F capacitor. Calculate the current for a frequency of 2.20kHz
Two spherical drops of mercury each have a charge of 0.14nC and a potential of 310V at the surface. What is the potential at the surface of the new drop
How much would an 80.0kg person weigh) on mars where an acceleration of gravity is 3.93m/s^2 and (b) on earth's moon where the acceleration of gravity is 1.63m/s^2.
A rod supports a 2.35 kg lamp. a) What is the tension in the rod? b) Estimate the components of the force that the bracket exerts on the rod.
Calculate the ratio of the drag force on a jet flying at 1132 km/h at an altitude of 10.0 km to the drag force on a prop-driven transport flying at 547 km/h
What is tension in each string
Imagine a frictionless pulley (a solid cylinder) of unknown mass M and radius r = 0.200 m which is used to draw water from a well. A bucket of mass m = 1.50 kg is attached to a massless cord wrapped around pulley. The bucket starts from rest at th..
A flight attendant pulls her 70 N flight bag a distance of 247 m along a level airport floor at a constant speed. The force she exerts is 33.00 N at an angle of 52° above the horizontal.
Assume that the partner moves on a circle that has a radius of 6.50 m. At a swinging speed of 4.45 m/s, what force must the man apply to his partner in the straight-down position?
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