Auroras are caused by

a. gases fluorescing in the atmosphere because of collisions with solar wind particles.
b. the magnetosphere of Earth touching its atmosphere.
c. the ozone layer being destroyed by UV light.
d. a product of the atmospheric greenhouse effect.
e. scattering of sunlight from particles in Earth's stratosphere.


a. gases fluorescing in the atmosphere because of collisions with solar wind particles.

Physics & Space Science

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An object is located in front of a converging lens with focal length F as shown. The image can be described as

A. upright, magnified, and real.
B. upright, diminished, and virtual.
C. inverted, diminished, and real.
D. inverted, magnified, and virtual.

Physics & Space Science

A single slit of width a is illuminated by light of wavelength ?. If a = 4.3?, the maximum number of dark fringes on a semi-circular screen surrounding the slit is

A. 2. B. 4. C. 6. D. 8. E. 9.

Physics & Space Science

The pitch of a musical sound is most related to

A) wavelength. B) frequency. C) speed. D) amplitude. E) all of the above

Physics & Space Science

If I = 2.0 mA and the potential difference, VA – VB = +30 V in the circuit segment shown, determine the charge and polarity of the capacitor



a.
1.5 mC, left plate is positive

b.
1.5 mC, right plate is positive

c.
0.45 mC, left plate is positive

d.
0.45 mC, right plate is positive

Physics & Space Science