Why are sunsets and sunrises red?
What will be an ideal response?
At sunset, sunlight travels through lots of atmosphere and blue light is scattered away.
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The ionic layers of the atmosphere reflect
a) radio waves. b) charged particles. c) sound. d) light.
The y component of the electric field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation
Ey = (375 N/C) cos[kx - (2.20 × 1014 rad/s)t]. What is the wavelength of this electromagnetic wave? (c = 3.0 x 108 m/s) A) 0.272 µm B) 17.1 µm C) 2.72 µm D) 1.36 µm E) 8.57 µm
Surface air blowing inward to a center of low pressure can rise, expand, and
A) cool, often condensing into clouds that produce precipitation. B) warm, producing generally clear skies. C) cool, producing generally clear skies. D) warm, often condensing into clouds that produce precipitation.
An Earth satellite is simply a projectile
A) freely falling around Earth. B) floating motionless in space near Earth. C) approaching Earth from outer space.