Heating from _________ causes the top of Earth's stratosphere to be warmer than the bottom.

a. higher-energy particles in the solar wind
b. convection
c. the ozone layer absorbing UV light
d. charged particles trapped by magnetic fields
e. the greenhouse effect


c. the ozone layer absorbing UV light

Physics & Space Science

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Why do white dwarfs have high temperatures?

A. chemical reactions on their surfaces B. heat left over from their formation C. nuclear fusion in their cores D. frictional heating from motions inside the white dwarfs

Physics & Space Science

What is the phase difference when two waves, traveling in the same medium, undergo constructive interference?

a. 270° c. 90° b. 180° d. 0°

Physics & Space Science

Force on a Wire: The magnetic force on a current-carrying wire in a magnetic field is the strongest when

A. the current is in the direction of the magnetic field lines. B. the current is in the direction opposite to the magnetic field lines. C. the current is at a 180° angle with respect to the magnetic field lines. D. the current is perpendicular to the magnetic field lines. E. the current is at a 0° angle with respect to the magnetic field lines.

Physics & Space Science

Recall that an up quark (u) has a charge of +2/3 and a down quark (d) has a charge of -1/3. Which of the following quark compositions describes a proton?

A) uuu B) uud C) udd D) uuudd

Physics & Space Science