Using a camera with a fixed focal length lens, how will increasing the f-number affect the depth of focus and the intensity of the light reaching the ccd (or film)?
a. The depth of focus will decrease but the intensity of light reaching the ccd will increase.
b. The depth of focus will increase as will the intensity of light reaching the ccd. c. The depth of focus will increase but the intensity of light reaching the ccd will decrease.
d. The depth of focus will decrease as will the intensity of light reaching the ccd.
C
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A particle (mass = 6.7 × 10?27 kg, charge = 3.2 × 10?19 C) moves along the positive x axis with a speed of 4.8 × 105 m/s. It enters a region of uniform electric field parallel to its motion and comes to rest after moving 2.0 m into the field. What is the magnitude of the electric field?
A. 2.0 kN/C B. 1.5 kN/C C. 1.2 kN/C D. 3.5 kN/C E. 2.4 kN/C
A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J.His kinetic energy at the top of the hill is
a. 0 J. b. 500 J. c. some value between 0 and 500 J. d. none of the above.
You are generating traveling waves on a stretched string by wiggling one end. If you suddenly begin to wiggle more rapidly without appreciably affecting the tension, you will cause the waves to move down the string
A) faster than before. B) slower than before. C) at the same speed as before.
Which is farthest?
a) a galaxy with a recessional velocity of 100000 km/s b) the most distant star in our Galaxy c) a quasar with a recessional velocity of 50000 km/s d) a galaxy with a recessional velocity of 20000 km/s e) a quasar with a recessional velocity of 10000 km/s