A laser beam (l = 694 nm) is incident on two slits 0.100 mm apart. Approximately how far apart (in m) will the bright interference fringes be on the screen 5.00 m from the double slits?
a. 3.47 × 10^-3
b. 3.47 × 10^-2
c. 3.47 × 10^-4
d. 3.47 × 10^-6
e. 3.47 × 10^-5
B
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A horizontal wooden beam sags a bit when supported at its ends. In between the top and bottom surfaces is a region of
A) tension. B) compression. C) neither of these
Europa is located outside the Sun's habitable zone and yet may be habitable. How can this be?
A) Europa's subsurface ocean contains lots of minerals that allow water to remain liquid at much lower temperatures B) Europa is continually being hit by comets and asteroids which keeps water beneath its surface liquid C) Europa is tidally heated, allowing liquid water to exist beneath its icy surface D) Europa is large enough to have appreciable heat trapped inside it to keep water beneath the surface liquid
An apple falls from an apple tree growing on a 20° slope. The apple hits the ground with an impact velocity of 16.2 m/s straight downward. What is the component of the apple's impact velocity parallel to the surface of the slope?
A) 5.5 m/s B) 8.7 m/s C) 12 m/s D) 15 m/s
Why is the Moon's average surface temperature so much lower than Earth's?
A. The Moon has no atmosphere to help retain heat at its surface. B. The Moon's rotation rate is much slower than Earth's. C. The Moon is much smaller than Earth and cooled more quickly. D. The Moon reflects more of the Sun's energy than Earth. E. The Moon has no magnetic field to prevent infrared radiation from escaping.