The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0
30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point). The near point of the person using the microscope is 25 cm and the far point is at infinity. What is the final overall magnification of the microscope?
A) -320 x B) -470 x C) -240 x D) -300 x E) -190 x
D
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The number of electrons in a neutral atom is called its
A) principal quantum number. B) orbital quantum number. C) magnetic quantum number. D) atomic number. E) none of the above answers.
Fusion is used in
a. atomic bombs b. power plants c. energy for stars d. hydrogen bombs e. a tokamak reactor
You are riding in a spaceship that has no windows or other means for you to observe or measure what is outside. You wish to determine if the ship is stopped or moving at constant velocity. What should you do?
A) You can determine if the ship is moving by determining the apparent velocity of light. B) You can determine if the ship is moving by checking your precision time piece. If its running slow, the ship is moving. C) You can determine if the ship is moving either by determining the apparent velocity of light or by checking your precision time piece. If its running slow, the ship is moving. D) You should give up because you have taken on an impossible task.
A beam of light passes through a polarizer and then an analyzer. In this process, the intensity of the light transmitted is reduced to 10% of the intensity incident on the analyzer
What is the angle between the axes of the polarizer and the analyzer?