Compound Microscope: The objective lens and the eyepiece of a microscope have focal lengths of 4.0 mm and 25 mm, respectively. The objective produces a real image 30 times the size of the object, with the final image viewed at infinity. The near point of the microscope user is at 25 cm. What is the distance between the objective lens and the real image that it produces?
A. 116 mm
B. 120 mm
C. 124 mm
D. 128 mm
E. 132 mm
Answer: C
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A. 6.7 × 10-4 B. 1.5 × 103 C. 1.5 × 10-5 D. 1.5 × 104
When a particle approaching a potential step has a total energy that is greater than the potential step, what is the probability that the particle will be reflected?
a. P < 0. b. P = 0. c. P = 1. d. P > 0. e. P = ?.
A hydrogen nucleus, which has a charge +e, is situated to the left of a carbon nucleus, which has a charge +6e. Which statement is true?
A) The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is equal to the force exerted on the carbon nucleus. B) The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is greater than the force exerted on the carbon nucleus. C) The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is less than the force exerted on the carbon nucleus. D) The electrical force experienced by the hydrogen nucleus is to the right, and the magnitude is equal to the force exerted on the carbon nucleus.
Compared with an alcohol barometer, the column height for a mercury barometer would be
A) lower. B) higher. C) the same.