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Grade 12 Quantum Physics and the Atom
Compton Scattering involves what kind of energy?
1. low energy x-rays
2. doesn't use any energy
3. moderate energy x-rays
4. very high energy x-rays
How can the law of conservation of mass apply to a burning log, if all that remains of it is ash?
1. The ash has the same mass as the log, although a large percentage of it blows away.
2. The law of conservation of mass applies to changes of state but not to chemical reactions.
3. The law of conservation of mass applies to substitution and displacement reactions, but not to combustion reactions.
4. The masses of the gases and water vapor released into the air by the combustion reaction plus the mass of ash equal the mass of the log before burning.
If the acceleration of an object is negative, its velocity
1. will be increasing.
2. will be decreasing.
3. will be zero.
4. will be constant.
If a body goes from 10m/s to 50m/s in 8 seconds, what is its acceleration?
1. $1.25m/s^2$
2. $5m/s^2$
3. $6.25m/s^2$
4. $40m/s^2$
What occurs when the angle of incidence of a light ray is greater than the critical angle?
1. critical refraction
2. total internal reflection
3. total external reflection
4. dispersion
A force applied to a body is said to do "work"
1. if the body is displaced in the direction of the applied force.
2. if the body is displaced in the direction opposite to the applied force.
3. even if the body does not move.
4. only when the body is moving.