What causes auroras and where are they most prominent on Earth?
What will be an ideal response?
Coronal mass ejections erupt from Sun's surface, particles are blown off by solar wind, hitting Earth's magnetic field and exciting the particles in the Earth's atmosphere, creating an amazing light display.
We see the emission lines from gases in Earth's upper atmosphere that are excited to glow by a complicated interaction with the solar wind and Earth's magnetic field.
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Which of these is a longitudinal wave
A) sound B) light C) radio D) all of the above E) none of the above
The glare seen from water is largely
A) horizontally polarized. B) vertically polarized. C) unpolarized.
A flashlight beam is seen because of
a. specular reflection. b. diffuse reflection. c. dispersion. d. refraction.
A stunt pilot weighing 0.70 kN performs a vertical circular dive of radius 0.80 km. At the bottom of the dive, the pilot has a speed of 0.20 km/s which at that instant is not changing. What force does the plane exert on the pilot?
a. 3.6 kN up b. 4.3 kN up c. 2.9 kN down d. 2.9 kN up e. 5.8 kN down