How can the Doppler Effect be used to determine if a storm is forming into a tornado?
What will be an ideal response?
Radar can determine the distance to a storm cloud. Since a tornado rotates (very rapidly) Doppler radar will measure the difference in velocity between the two sides of the storm to determine if it is rotating.
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What is the relationship between wavelength (?) and frequency (f)? ("c" is the speed of light.)
A. ?/f = c B. f/? = c C. ?f = c D. ?c = f
Tycho Brahe's contribution to Kepler's Laws of Planetary Motion were
A) his detailed and accurate observations of the planet's position. B) his observations of Jupiter's moons. C) a mathematical explanation of epicycles. D) a precise lunar calendar. E) the correct explanation of lunar phases.
The images formed by concave lenses
A) are always virtual. B) could be real or virtual, but always real when the object is placed at the focal point. C) could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length. D) are always real.
At what speed would a proton need to circle the Earth at a height of 1 000 km above the equator if the Earth's magnetic field is horizontal and directed north-south, with an intensity of 4.00 × 10^?8 T? (The radius of the Earth is 6 400 km and the charge and mass of the proton are q = 1.60 × 10^?19 C and mp = 1.67 × 10^?27 kg. Ignore relativistic corrections.)