Angular momentum is defined as
A. Moment of inertia * velocity
B. Mass * angular velocity
C. Mass * velocity
D. Moment of inertia * angular velocity
Ans: D. Moment of inertia * angular velocity
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Suppose that an atom has exactly two energy levels separated by an energy difference ?E. When such atoms are in contact with a reservoir at a temperature T1, the ratio of the number of atoms in the higher level to the number in the lower level is 
. If we increase the temperature to T2, the numerical value of this ratio
A. increases. B. decreases. C. remains the same.
Hydrogen lines are strongest in class A stars
Indicate whether the statement is true or false
The process of boiling water tends to
A) warm the water. B) cool the water. C) both of these D) none of the above
Distinguish between metamorphic foliation and sedimentary layering
What will be an ideal response?