Which of the following statements about constellations is false?
A) There are only 88 official constellations.
B) Some constellations can be seen from both the Northern and Southern hemispheres.
C) Some constellations can be seen in both the winter and summer.
D) It is possible to see all the constellations from Earth's equator.
E) Most constellations will be unrecognizable hundreds of years from now.
E
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The focal length of a thin lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens?
A) f/4.0 B) f/2.0 C) f/5.6 D) f/0.30 E) f/0.40
A ball rolls without slipping down incline A, starting from rest. At the same time, a box starts from rest and slides down incline B, which is identical to incline A except it is frictionless. Which has a larger translational speed at the bottom of the ramp?
1.They have the same translational speed at the bottom of the ramp. 2.the ball 3.the box 4.It is impossible to determine.
A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV
What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 6.8 × 1014 Hz B) 2.7 × 1014 Hz C) 7.6 × 1014 Hz D) 8.5 × 1014 Hz E) 9.4 × 1014 Hz
A 6.0-J pulse of light from a laser has what momentum?
a. Light does not have momentum because it doesn't have mass. b. 3.0 × 10^9 kg•m/s c. 6.7 × 10^–9 kg•m/s d. 2.0 × 10^–8 kg•m/s