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A PuBe source has a neutron activity of 1.6 X 105 Bq. The neutrons are produced by the 9Be(a, n)12C reaction with an effective cross section of 90 mb and thickness of 3.2 cm.
(a) What is the probability of an incident alpha particle interacting with a 9Be nucleus?
(b) What must be the rate of alpha particles incident on 9Be?
(c) What must be the amount of mass of the 239Pu producing the alpha particles?
Four force vectors act simultaneously on a 65 kg object. Force One is 211 N West, Force Two is 193 N at an angle 28.0 degrees north of west, What is the magnitude of the final acceleration of the object
The acceleration due to gravity on the Moon is about one-sixth what it is on Earth. how many times higher will it go than it would on Earth
An astronaut is traveling in a space vehicle that has a speed of 0.520c relative to Earth. The astronaut measures his pulse rate at 77 per minute. Evaluate what would be the pulse rate if the speed of the space vehicle were increased to 0.910c
Four resistors 13 ohm, 17 ohm, 19 ohm, and 32 ohm are in parallel. Calculate the equivalent resistance
A railroad whistle is sounded. An echo is heard 5.0 seconds later. If the speed of sound is 343m/s, how far away is the reflecting surface?
1. A pressure drop of 50 kPa due to fluid friction through 1-in wrought iron pipe ismeasured. The fluid flows at a rate of 0.04 kg/s. The fluid viscosity is 2 cP and itsdensity is 1000 kg/m3. Find the length of the pipe?
Determine the angular acceleration
An ideal massless spring is hanging vertically. When an unknown mass is attached to the spring, the spring stretches by 4.8 cm before reaching a new equilibrium. What is the frequency of the resulting oscillation
An ambulance siren is the source of sound emitted with a frequency of 1600 Hz. What is the frequency of the reflected sound wave heard at the ambulance
A blue ball is thrown upward with an initial speed of 21.8m/s, from a height of 0.6m above the ground. 2.7 seconds after the blue ball is thrown, How long after the blue ball is thrown are the two balls in the air at the same height
a light ray is travelling in air is incident on one face of a right angle prism with index of refraction n1.5 and the
An electron moving from the negative terminal to the positive terminal of a 12 volt battery gains(or loses) how much energy? Indicate whether it is a gain or lost in energy. Why Sketch the two terminal "plates" of the battery and theelectric field ..
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