What are cosmic rays?
A) subatomic particles that travel close to the speed of light
B) a form of light with shorter wavelength than gamma rays
C) fast-moving dust particles in the interstellar medium
D) any light waves from space
A) subatomic particles that travel close to the speed of light
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A 150 W light bulb is designed for an ac voltage of 120 V rms. What is the resistance of the bulb?
A. 150 
B. 144
C. 96.0
D. 68.0
E. 48.0
Light behaves primarily as a particle when it
A) travels from one place to another. B) interacts with matter. C) both of these D) neither of these
If the stress component ?xx is given by ? xx = ?p + 2? ?u/?x , the incompressible fluid is:
(A) Linear and isotropic (B) Isotropic and homogeneous (C) Linear and homogeneous (D) Linear, isotropic, and homogeneous
The circuit below contains 5 identical light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?
a.
A: The one closest to the positive terminal of the battery.
b.
A and C: The bulbs closest to the positive terminal of the battery.
c.
A and B: Because they are closest to the terminals of the battery.
d.
C and D: Because they receive current from A and B and from E.
e.
E: Because the potential difference across E is that of the battery.