Thin Films: A 500-nm-wavelength beam of light illuminates a soap film with air on both sides and an index of refraction 1.33. If the beam of light is incident normally on the film, what is the minimum thickness of the film to make the reflected light enhanced in brightness?
A. 47.0 nm
B. 74.0 nm
C. 94.0 nm
D. 152 nm
E. 268 nm
Answer: C
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As a radioactive substance gradually decays, the abundance of daughter ____ gradually increases
a. atoms b. isotopes c. elements d. cells e. nuclei
During the eighteenth and nineteenth centuries, attempts to precisely measure the astronomical unit relied largely on rare:
A) total solar eclipses. B) transits of the inferior planets across the Sun. C) passages of comets close to the Earth. D) maximum elongations of Venus. E) oppositions of Mars.
X-ray telescopes are located in orbit around the Earth because:
A) X-ray telescopes on Earth would have to be too big. B) X-ray telescopes are cheap and easy to launch into space. C) there are too many X-ray telescopes on Earth, so now they are put in space. D) X-rays don't reach the surface of Earth. E) the X-rays that come out of the telescopes are dangerous to humans.
If F = 4.0 N and m = 2.0 kg, what is the magnitude a of the acceleration for the block shown below? The surface is frictionless
a.
5.3 m/s2
b.
4.4 m/s2
c.
3.5 m/s2
d.
6.2 m/s2
e.
8.4 m/s2