The distance between the object to be viewed and the eyepiece of a compound microscope is 18.0 cm
The focal length of its objective lens is 0.80 cm and the eyepiece has a focal length of 2.3 cm. The near-point distance of the person using the microscope is 25.0 cm. What is the magnitude of the total magnification of the microscope if it is designed for minimum eyestrain?
A) 120
B) 184
C) 200
D) 360
E) 480
C
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How do we know sunspots have magnetic fields?
A. Wien's law B. the Zeeman effect C. We have measured the sunspots' fields with spacecraft. D. the Hubble effect E. None of these choices is correct.
A parallel-plate capacitor is disconnected from a battery, and the plates are pulled a small distance further apart. Does the energy stored in the capacitor increase, decrease, or stay the same?
1.increase 2.decrease 3.remains the same
Which of these is the Galilean principle of relativity?
a. E = mc2. b. Energy cannot be created or destroyed. c. The laws of motion are the same in all reference systems. d. The laws of motion are the same in all inertial reference systems. e. The laws of motion only apply in inertial reference systems.
The efficiency of a Carnot engine would be increased if
A. the high and low temperatures were both lowered by 100°C. B. the high and low temperatures were both raised by 100°C. C. the low temperature were raised by 100°C. D. the high temperature were lowered by 100°C.