1、求解一道SAT物理题

s double-slit interfernce experiment,what is the difference in path length of the light waves from the two slits at the center of the first bright fringe above the central maximum?

A. 0

B.1/4

C.1/2

D.1

E 3/2

注：B,C,D,E项，因为打不出，我漏了波长的基本单位，中文译音大概是“郎木塔”", 'contentText': "In Young's double-slit interfernce experiment,what is the difference in path length of the light waves from the two slits at the center of the first bright fringe above the central maximum?

A. 0

B.1/4

C.1/2

D.1

E 3/2

注：B,C,D,E项，因为打不出，我漏了波长的基本单位，中文译音大概是“郎木塔”", 'supply': '说实话,我是一文科生,不太明白这个光的干涉;;还有,回答的时候,能不能注明背景知识///对拉,这是一道单选题

2、SAT 物理（翻译加解答）

s weight has apparently doubled according to the reading on the scale, what is the acceleration of the platform?

A. about 9.8 m/s^2 up

B. about 9.8 m/s^2 down

C. about 19.6 m/s^2 up

D. about 19.6 m/s^2 down

E. It cannot be determined without knowing the mass of the person.", 'contentText': "A person is standing on a scale that is located on a platform at the surface of the earh. The platform is supported by a machine that can move the platform up and down at various accelerations while keeping it level. If the person's weight has apparently doubled according to the reading on the scale, what is the acceleration of the platform?

A. about 9.8 m/s^2 up

B. about 9.8 m/s^2 down

C. about 19.6 m/s^2 up

D. about 19.6 m/s^2 down

E. It cannot be determined without knowing the mass of the person.", 'supplyRich': '

3、一道SAT物理题

Which of the following can actually lower the internal evergy of a room

A.a fan

B.a refregerator with its door open

C.a refregerator with its door closed

D.an air conditioner in the middle of a room

E. an air conditioner partially exposed to the outside.

你们先选吧。然后解释。答案太诡异了。实在捉摸不透。谢谢~

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