A double convex lens has faces with radii of magnitudes 18.0 cm and 20.0 cm. When an object is placed 24.0 cm in front of the lens, a real image is formed 32.0 cm from the lens
(a) What is the focal length of this lens?
(b) What is the index of refraction of the material from which the lens is made?
(a) 13.7 cm (b) 1.69
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Which of the following does not accurately describe what we observe toward the Galactic center?
A) at radio wavelengths, we see giant gas clouds threaded by powerful magnetic fields B) at infrared wavelengths, we see a massive stellar cluster C) at optical wavelengths, we see a cluster of old, red stars D) at X-rays, we see faint emission from an accretion disk around a black hole
As an object is lowered into a deep hole in the surface of the Earth, which of the following must be assumed in regard to its potential energy?
a. increase b. decrease c. remain constant d. cannot tell from the information given
A 0.10-?F capacitor is connected to a 120-V rms 60-Hz source. (a) What is its capacitive reactance? (b) What is the rms current to the capacitor? (c) If both the capacitance and the frequency were doubled, what would be the rms current?
What will be an ideal response?
The SI unit of electric charge is
a. e, the charge on the electron b. the coulomb c. the ampere d. the ohm e. the volt