____________ of hydrogen atom nuclei in the core replace the heat the Sun ____________ to keep it in equilibrium
a. Nuclear fusion reactions; loses into space
b. Nuclear fusion reactions; gains from empty space
c. Chemical reactions; loses into space
d. Chemical reactions; gains from empty space
e. Nuclear fission; loses into space
a
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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.
In a demonstration, a 4.00 cm2 square coil with 10000 turns enters a larger square region with a uniform 1.50 T magnetic field at a speed of 100 m/s. The plane of the coil is perpendicular to the field lines. If the breakdown voltage of air is 4000 V/cm on that day, the largest gap you can have between the two wires connected to the ends of the coil and still get a spark is
a. 7.5 × 10^?3 cm. b. 0.015 cm. c. 7.5 cm. d. 13 cm. e. 15 cm.
When a beam of light that is traveling in glass strikes an air boundary at the surface of the glass, there is
A) a 90° phase change in the reflected beam. B) no phase change in the reflected beam. C) a 180° phase change in the reflected beam. D) a 60° phase change in the reflected beam. E) a 45° phase change in the reflected beam.
A spool has string wrapped around its center axle and is sitting on a horizontal surface. If the string is pulled in the horizontal direction when tangent to the bottom of the axle, the spool will