(B)Amplitude
(C)Period
(D)Wavelength
(E)Kinetic Energy
1. Which is measured in hertz?
2. For a mass on a spring, which is maximized when the displacement of the mass from its equilibrium position is zero?
3. Which quantity is not applied to pendulum motion?
The weakness of classification questions is that the same five answer choices apply to several questions. Invariably, some of these answer choices will be tempting for some questions but not for others. For instance, you can be pretty sure that kinetic energy isn’t measured in hertz: E may be a tempting answer choice for other questions but not for that one, so you can eliminate it. Another point that may help you guess in a pinch is that you’ll rarely find that the same answer choice is correct for two different questions. The directions for classification questions explicitly state that an answer choice “may be used once, more than once, or not at all,” but on the whole, the ETS people shy away from the “more than once” possibility. This is by no means a sure bet, but if you’re trying to eliminate answers, you might want to eliminate those choices that you’ve already used on other questions in the same set. If you’re wondering, the answers to the above questions are 1 A, 2 E, and 3 D. “EXCEPT” Questions
All of the following are true about an -particle EXCEPT
(A)It has an atomic mass of 4
(B)It carries a positive charge
(C)It is identical to the nucleus of a helium atom
(D)It will always pass right through a thin sheet of gold foil
(E)It contains two neutrons
Questions of the “EXCEPT” variety contain a bunch of right answers and one wrong answer, and it’s generally possible to spot one or two right answers. Even if you can’t answer the question confidently, you might remember that alpha particles have a positive charge and that they are identical to the nucleus of a helium atom. Already, you’ve eliminated two possible answers, and can make a pretty good guess from there. If you’re interested, the answer is D: Rutherford’s gold foil experiment showed that alpha particles would occasionally deflect off the gold foil at extreme angles, thus proving that atoms have nuclei. “I, II, and III” Questions
For which of the following is f > 0:
I. Concave mirror
II. Convex mirror
III. Converging lens
(A)I only
(B)II only
(C)I and III only
(D)II and III only
(E)I, II, and III
In this style of multiple-choice question, the “I, II, and III” questions provide you with three possible answers, and the five answer choices list different combinations of those three. There’s an upside and a downside to questions like these. Suppose you know that a concave mirror has f > 0 and a convex mirror doesn’t, but you’re not sure about a converging lens. The downside is that you can’t get the right answer for sure. The upside is that you can eliminate B, D, and E, and have a 50% chance of guessing the right answer. As long as you’re not afraid to guess—and you should never be afraid to guess if you’ve eliminated an answer—these questions shouldn’t be daunting. The value of f for a converging lens is positive, so the answer is C. Physics Hint 6: Be Flexible Knowing your physics formulas is a must, but they’re useless if you don’t know how to apply them. You will probably never be asked to calculate the force acting on an object given its mass and acceleration. Far more likely, you will be asked for the acceleration given its mass and the force acting on it. Knowing that F = ma is useless unless you can also sort out that a = F m. The ETS people don’t want to test your ability to memorize formulas; they want to test your understanding of formulas and your ability to use formulas. To this end, they will word questions in unfamiliar ways and expect you to manipulate familiar equations in order to get the right answer. Let’s look at an example.英语作文
【在百度搜索更多与“SATIIPhysicsTest-TakingStrategies(2)”相关英语作文】