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A small 1.85-GBq 198Au source (maximum beta-particle energy0.961 MeV, average 0.315 MeV) is enclosed in a lead shield justthick enough to absorb all the beta particles. a) Estimate the energy ?uence rate due to bremsstrahlung ata point 50 cm away. b) What is the estimated bremsstrahlung photon ?uence rateat that point for the purpose of assessing the potentialradiation hazard?
A person is watching water waves at the ocean and they notice the peak to peak distance between the waves is 3.4 m. How fast are the waves going
A race car starts from rest on a circular track of radius 490 m. The car's speed increases at the constant rate of 0.740m/s2. find the speed of the race car
A railroad train is traveling at 30.0 m/s in still air. What frequency is heard by a passenger on a train moving in the opposite direction to the first at 18.0 m/s and approaching the first
the resistivity of silver at 20 degrees C is 1.59 x 10^-8 ohms*m and it temp coefficient is 0.0061/degree C. Find resitance of silver wire at 43 degree C
A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -95?C. By how much does her mass increase
A thin rod of length 0.89 m and mass 110 g is suspended freely from one end. It is pulled to one side and then allowed to swing like a pendulum, how far above that position the center of mass rises
A box is at rest on a horizontal table. Is it because of the first law, second law, and or third law of motion that those two forces are equal
A 100-W lightbulb has a resistance of about 12 ?when cold (20 ?C) and 156? when on (hot). Estimate the temperature of the filament
A blue ball is thrown upward with an initial speed of 24.3 m/s, from a height of 1 meters above the ground. What is the speed of the blue ball when it reaches its maximum height
In a lightning bolt, a large amount of charge flows during a time of 2.9 x 10-3 s. Assume that the bolt can be represented as a long, How much charged has flowed during the lightning bolt?
A light ray is incident upon a plane interface between two materials. what is the refracted angle (in degrees) in that material
A 950-kg race car can drive around an unbanked turn at a maximum speed of 41 m/s without slipping. What would be the maximum speed if no downforce acted on the car
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