In the context of the Sun's surface, which of the following is the source of most of the sunlight received by Earth?
A) The corona
B) The chromosphere
C) The convection zone
D) The photosphere
D
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Spectrographs use a prism or a grating to spread starlight according to wavelength
a. True b. False Indicate whether the statement is true or false
Retrograde motion is discernible by watching a planet over the course of
A. a few minutes. B. many years. C. many nights. D. many hours.
A laser with a power of 1.0 mW has a beam radius of 1.0 mm. What is the peak value of the electric field in that beam? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 490 V/m B) 840 V/m C) 65 V/m D) 120 V/m E) 22 V/m
In special relativity, we learned that people in different reference frames will measure time differently. According to general relativity, why does this happen?
A) People in different reference frames experience different realities. B) It is an illusion, and time really is the same for everyone. C) They have different worldlines. D) They are experiencing the same spacetime reality, but from different perspectives.