The rms speed of the molecules of a gas is 200 m/s at a temperature 300 K. What is the mass of the individual molecules?
A)
2.13 × 10-25 kg
B)
2.45 × 10-25 kg
C)
5.66 × 10-25 kg
D)
1.78 × 10-25 kg
E)
3.11 × 10-25 kg
E
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What is the safest way or method to observe a solar eclipse?
a. using a telescope b. wearing sunglasses c. by observing with your naked eyes d. through a pinhole projection e. through a UV filter held up to the sky
A solar eclipse that occurs when the Moon's umbra does not reach Earth's surface is called
a. a total solar eclipse. b. a partial solar eclipse. c. an annular solar eclipse. d. a penumbral solar eclipse. e. an umbral solar eclipse.
Mathilda collects photoelectric data in her physics laboratory
She measures a stopping potential of 5.82 volts for radiation of wavelength 100. nm, and 17.99 volts stops 50.0 nm. (a) What is the work function for the material in eV? (b) From her data one determines Planck's constant to be what?
What observational evidence supports the conclusion that most of the mass of the Milky Way is in the form of dark matter?
A) There is no observational evidence; it is only a theoretical idea based on computer models indicating that the Milky Way could not have formed unless it had much more mass than it contains in stars and gas. B) Although dark matter emits no visible light, we have detected it with radio telescopes. C) We can see the dark matter as dark blotches in the sky, such as the dark lanes that are visible within the Milky Way in the night sky. D) The orbital speeds of stars and gas clouds far from the galactic center are surprisingly high, suggesting that these stars and gas clouds are feeling gravitational effects from unseen matter.