What does enriching uranium do?
a. Increases the percentage of radioactive uranium-235 and thus improves the probability of chain reactions.
b. Increases the percentage of uranium-238 and thus improves the probability of chain reactions.
c. Increases the fraction of the material that consists of plutonium.
d. Increases the percentage of neutrons in the bombardment beam that attempts to set off a chain reaction.
e. Increases the speed at which uranium decays into lead, i.e., decreases the half-life.
a
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Young's Modulus: A wire that is 1.0 mm in diameter and 3.5 m long stretches 3.5 mm when an 8.0-kg tool is hung from it.(a) What is Young's modulus for the material from this wire is made?(b) What is the effective spring constant for the stretching wire?
What will be an ideal response?
When a karate chop breaks a board with a 3000-N blow, the amount of force that acts on the hand is
A) zero. B) 1500 N. C) 3000 N. D) 6000 N.
A grating has 450 lines per millimeter. What is the highest order m that contains the entire visible spectrum from 400 nm to 700 nm?
A) m = 2 B) m = 3 C) m = 4 D) m = 5 E) m = 6
Which is a unique feature of Pluto's satellite, Charon, standing out from most other satellites?
a. has an atmosphere b. tidally locked to Pluto c. mostly composed of rock d. its surface is composed of methane ice e. orbits in the plane of Pluto's equator