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Strontium-90 is to be used in a radioisotopic thermoelectric generator (RTG) for powering a navigation beacon located in the arctic.
a) How much of the Sr-90 activity is required to generate 50 W of electric power if the conversion efficiency from heat to electricity is 30%? Tip: You must take into account the fact that Sr-90 is in equilibrium with its daughter, Y-90.
b) What is the mass of Sr-90 required?
c) Weight is an important factor in the design of a portable, isotopic heat source. If weight is to be kept at a minimum and if the source is to generate 50 W after 1 year of operation, would there be an advantage to using Po-210 compared to Sr-90?
Neptune is an average distance of 4.50 x 109 kilometer from the Sun. Find the length of the Neptunian year given that the Earth is 1.50 x 108 kilometer from the Sun on the average
A velocity selector has an electric field of magnitude 2620 N/C,directed vertically upward, and a horizontal magnetic field that isdirected south. Charged particles, traveling east at a speed of6.75 x 103 m/s, enter the velocity selector and are ab..
a sound wave traveling in 26 degrees C air has a pressure amplitude of 0.500 Pa. (assume that the density of air is 1.29 kg/m^3). What is the intensity of the wave
Light of wavelength 2E-12 m undergoes compton scattering at an angle of 45 degrees, What is the wavelength of the scattered photon
A swimmer heads directly across a river, swimming at2.80 m/s relative to still water. He arrives at a point 49.0 m downstream from the point directly across the river, which is 73.0m wide. What is the swimmer's speed relative to the shore?
A 1 m long pedulum with a 2kg mass is pulled back 0.1m and after that released, so that it swings back and forth. How did they solve T= 2.007 seconds.
a plane convex lens made of glass n 1.50 with one flat surface and the other having a radius of 20 cm. what is the
A roller coaster car moves 200 ft horizontally and then rises 135 ft at an angle of 30 degrees above the horizontal, What is its displacement from its starting point
Light from the bottom of a swimming pool is incident on the surface at an angle of 20°. What is the angle of refraction
In a head-on collision, a car stops in 0.15 second from a speed of 22 m/s. Find what force is applied to the driver by his seat belt during that fraction of a second
An ocean liner leaves New York City and travels 20.0° north of east for 199km. How far east and how far north has it gone? In other words, what are the magnitudes of components of ship's displacement vector in the following directions.
you are traveling in a convertible with the top down. the car is moving at a constant velocity 25.5 ms due east along
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