When we see a crescent moon, the rest of the face that we see is not completely dark because
A) it is partially facing toward the Sun.
B) it is slightly illuminated by sunlight reflected by Earth.
C) it is slightly illuminated by starlight.
D) it is slightly illuminated by the light of Earth's cities.
B) it is slightly illuminated by sunlight reflected by Earth.
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When the electric field is zero at a point, the potential must also be zero there
A) True B) False
Diffuse reflection occurs when the size of surface irregularities is
A) small compared to the wavelength of the light used. B) large compared to the wavelength of the light used. C) either
The choices below describe four hypothetical planets. Which one would you expect to have the most features of erosion? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)
A) Size: same as Venus. Distance from Sun: same as Mars. Rotation rate: once every 25 hours. B) Size: same as the Moon. Distance from Sun: same as Mars. Rotation rate: once every 10 days. C) Size: twice as big as Earth. Distance from Sun: same as Mercury. Rotation rate: once every 6 months. D) Size: same as Mars. Distance from Sun: same as Earth. Rotation rate: once every 18 hours.
You want to confine an electron in a box (an infinite well) so that its ground state energy is 5.0 × 10-18 J
What should be the length of the box? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 0.11 nm B) 0.22 nm C) 0.15 nm D) 0.18 nm