This x-ray image shows a loop of hot gas above the surface of the Sun. Suppose we took another photo looking at the same place 1 hour later. What would we see?
A) The loop would look about the same as it does in this photo.
B) The loop would have shot much higher up above the Sun's surface.
C) The loop would have collapsed back down, so we would not see it anymore.
D) The loop would have turned blue as the gas became hotter.
A) The loop would look about the same as it does in this photo.
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Photon Energy: A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
Contrast the sizes of molecular clouds with emission nebulae
What will be an ideal response?
A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. A uniform electric field is also present. Due to the combined effect of both fields, the particle does not change its velocity
What is the direction of the electric field? A) along the -y-axis B) along the +y-axis C) along the -x-axis D) along the +x-axis E) along the -z-axis
Why is the sky blue?
a. Because it reflects the ocean. b. Because water droplets refract the light. c. Because blue light is scattered more than red light by atmospheric molecules. d. Because blue is the complementary color to the yellow Sun. e. Because dust particles in the air scatter different colors of light differently.