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The ground state 1s1 H atom has two hyperfine states, F = 0 and F = 1, which correspond to different relative orientations of the nuclear spin and electron spin. The transition between these two states has a wavelength of 21 cm and is one of the most important transitions in observational astronomy. The shape of our galaxy and many of its other properties were determined by measurements of this transition. Calculate the fraction of H atoms in each of these states at a temperature of 100 K. he F = 1 state is the ground state and there are no other states with significant population.
a small toy car of mass 50 gm is released from rest at a height h to slide down a ramp into a vertical loop of diameter
Flow occurs in a wide rectangular channel at a depth y. A construction project over this channel requires that cofferdams spaced at distance „ on centerlines be placed in the channel (Fig. P10.34).
What are the advantages of this technique?
If the 5-kg block is suspended from the pulley B and the sag of the cord is d = 0.15 m, determine the force in cord ABC. Neglect the size of the pulley
a completely reversible air container provides 36000btuhr of cooling for a space maintained at 70 degrees fahrenheit
the rubber mallet is used to drive a cylindrical plug into the wood member. if the impact force varies with time as
determine the torque that can be applied to a solid shaft of 20-mm diameter without exceeding an allowable shearing
Calculate the mass in milligrams of quinine in the tablet.
A solid circular shell is made of steel that may be treated as perfectly elastoplastic. The shear stress yielding point for the steel is 165 MPa. The modulus of rigidity for the steel is 80 GPa. A torque is applied such that the shear stress reaches ..
a household refrigerator that has a power input of 80w assume constant work input over time and a coefficient of
air at 325 k and 70 kpa flows over the upper side of a 1-m-square plate. the upper plate is maintained at a constant
consider a long cylinder of porous material of radius r in which a gas a is being generated throughout the cylinder at
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