Which of the following provides evidence for the quantization of light?
A) Interference effects seen when light passes through a narrow opening
B) The individual dots seen on a photographic plate when a photo is taken at extremely short exposure times
C) Both of the above.
D) Experiments that spread light out into a spectrum of colors
E) All of the above.
B
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A segment of wire carries a current of 25 A along the x axis from x = ?2.0 m to x = 0 and then along the z axis from z = 0 to z = 3.0m. In this region of space, the magnetic field is equal to 40 mT in the positive z direction. What is the magnitude of the force on this segment of wire?
A. 1.0 N B. 5.0 N C. 2.0 N D. 3.6 N E. 3.0 N
All spiral galaxies have both a disk and spheroidal component to their stellar populations
Indicate whether the statement is true or false
The first self-sustaining nuclear fission reaction was achieved in Chicago in 1942 under the direction of a scientist named ______________
Fill in the blank(s) with correct word
A uniform rod is hinged to a wall and held at a 30° angle by a thin string that is attached to the ceiling and makes a 90° angle to rod. Which statement(s) must be true? (At least one of them is true and at least one is false.)
1.The hinge force is purely vertical.
2.The hinge force is purely horizontal.
3.The string tension is equal to the hinge force.
4.The string tension is smaller than the rod's weight.
5.1 and 3 are true.
6.2 and 3 are true.
7.1 and 4 are true.
8.2 and 4 are true.
9.3 and 4 are true.
10.Three of the statements are true.