Cracking the SAT Physics Subject Test
What’s the daughter nucleus in each of the following radioactive decays? ...
(a) Strontium-90 ; β− decay (b) Argon-37 ; electron capture (c) Plutonium-239 ; alpha decay (d) Cobalt-58 ; β+ decay You Got Che ...
A = A 0 e−λt where A 0 is the activity at time t = 0 and λ is the decay constant (not to be confused with wavelength). Activity ...
The half-life of iodine-131 (a β− emitter) is 8 days. If a sample of^131 I has a mass of 1 gram, what will the mass be 40 days ...
Here’s How to Crack It Every 8 days, the sample’s mass decreases by a factor of 2. We can illustrate the decay in the following ...
NUCLEAR REACTIONS Natural radioactive decay provides one example of a nuclear reaction. Other examples of nuclear reactions incl ...
Here’s How to Crack It In order to balance the superscripts, we must have 1 + 198 = 197 + A, so A = 2, and the subscripts are ba ...
Disintegration Energy Nuclear reactions not only produce new nuclei and other subatomic particles but also involve the absorptio ...
SPECIAL RELATIVITY The SAT Physics Subject Test may ask a question or two on Einstein’s theory of special relativity. Since you ...
only going 5 m/s. Now let’s look at Postulate 2 more closely. 1) The Relativity of Velocity Let’s say that the man in the train ...
when u or v is close to the speed of light that the difference becomes measurable. Let’s apply the correct formula to our previo ...
As stated in Postulate 2 of the Theory of Special Relativity, the speed of light through empty space is always measured to be c ...
the frame at rest with respect to an event. In this case, the sneezing is the event, so the proper time is measured by a clock a ...
L 1 can be referred to as the proper length, which is the length measured in the frame at rest with respect to the object. In th ...
Here’s How to Crack It As measured on Earth, the time interval between the moment when the muon is created and the moment it de ...
if the two events occur at the same location in the reference frame of the observer. An object’s length is said to be proper if ...
energy, Erest = mc^2 , and its kinetic energy. If we plot the kinetic energy of a particle of mass m as a function of its speed ...
Energy and the Speed of Light The kinetic energy needed to bring a small mass to the speed of light is infinite. The relationshi ...
Contemporary Physics While 1915 may seem like a long time ago, virtually all physics that has been done since then (with the exc ...
go straight instead; it is impossible to distinguish between a reference frame that is moving at a constant velocity and one tha ...
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