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An excited electron in Na atom emits radiation at a wavelength 589nm and returns to the ground state. If the mean time for the transition is 20ns, ineherent width in the emission line. What is the length of the photon emitted?
What should be the spring constant of a spring designed to bring a 1400 car to rest from a speed of 95 so that the occupants undergo a maximum acceleration of 5.
Neutron stars are so named because they are composed of neutrons and have a density the same as that of a nucleus. find the radius of a neutron star
Show that the force between parallel wires carrying currents I1 and I2, both in the same direction, find the magnetic force on segment dI2 of wire 2.
a student standing on a train staiton observes that the pitch (frequency) of the train decreases from 888.8 Hz to 862.8 Hz, What is the speed of the train
Two large parallel plates are separated by 0.90cmand carry uniform charge densities equal in magnitude and opposite in sign, Find the magnitude of the charge density on the plates
A circular loop in the plane of the paper lies in a 0.55T magnetic field pointing into the paper. If the loop's diameter changes from 20 cm to 5 cm what is the magnitude of the average induced emf.
the velocity of a boat with respect to the water is 4.0 m/s at an angle of 30.0 degrees North of East. What is the velocity of the boat
A physics instrutor is in a dryer traveling at w=275rad/s. calculate the centripetal force on the instructor
compute the distance from the central maximum to the first bright region on either side of the central maximum.
If the top coil were rotated 90 degrees about a vertical axis through the center of the coil so it is perpendicular to the balance coil, how would the results of the experiment change
The index of refraction for violet light in silica flint glassis 1.66, and that for red light is 1.62. What is the angulardispersion of visible light passing by an equilateral prism ofapex angle 60.0° if the angle of incidence is 50°.
Consider the following pipe assembly containing a permeable filter of length L=20cm, area A=20cm^2, and permeability of 4 millidarcys. what is the velocity of the flow through the filter section
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