One explanation of the dark sky Olbers's Paradox is that light can reach us only from objects in space out to a distance in light years _______ the age of the universe in years
a. less than
b. greater than
c. equal to
d. less than or equal to
e. greater than or equal to
d
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The difference between lightwaves approaching and lightwaves receding is
A) when approaching, lightwaves have higher frequency; when receding their frequency is lower. B) when approaching, lightwaves have lower frequency; when receding their frequency is higher. C) the frequency of approaching lightwaves remain constant, while receding lightwaves are invisible. D) There is no difference
If the distance between the slits in Young's two-slit experiment is decreased, which one of the following statements is true of the interference pattern?
A) The distance between the maxima stays the same. B) The distance between the maxima decreases. C) The distance between the minima stays the same. D) The distance between the minima increases. E) Impossible to tell without knowing the wavelength of light in use.
You toss a ball straight up in the air. At the highest point, the ball's
A. velocity is zero and the acceleration is downward. B. velocity and acceleration are zero. C. acceleration is zero but not its velocity. D. velocity is zero and the acceleration is upward.
Constant Acceleration Kinematics: A car with good tires on a dry road can decelerate (slow down) at a steady rate of about 5.0 m/s2 when braking. If a car is initially traveling at 55 mi/h(a) how much time does it take the car to stop?(b) what is its stopping distance?
Fill in the blank(s) with the appropriate word(s).