An expandable container holds 2.30 mole of helium, He, gas with an initial pressure of 770 kPa and an initial volume of 2.10 L. The gas expands isothermally to a final pressure of 350 kPa
How much heat is gained by the gas during this process? (R = 8.31 J/mol ? K) A) 1280 J
B) 792 J
C) 685 J
D) 1370 J
E) 1700 J
A
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a. A, K b. M, F c. B, O d. L, G
Why do we see a gravitational redshift in the spectrum of the Sun?
A) Time runs slower on the Sun than on Earth, making lines in the solar spectrum have lower frequency and hence longer wavelength than normal. B) Gravity makes light heavy, causing it to appear redder. C) Because of gravity, the Sun is always moving away from us so we see a redshift. D) Spacetime curvature allows red photons of light to escape the Sun more easily than blue photons, leading to an apparent redshift.
Which is a consequence of the synchronous orbit of the Earth's Moon (equal period ofrotation and revolution) ?
a) lunar eclipses b) phases of the Moon c) same side of the Moon always faces the Earth d) solar eclipses e) craters on the Moon
The intensity of solar radiation near the earth is 1.4 × 103 W/m2. What force is exerted by solar radiation impinging normally on a 5.0 m2 perfectly reflecting panel of an artificial satellite orbiting the earth?
A) 1.4 × 104 N B) 9.4 × 10-5 N C) 1.4 × 10-4 N D) 2.3 × 10-5 N E) 4.7 × 10-5 N