The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by 
in SI units. What is the wavelength of the EM wave?
A. 120 m
B. 240 m
C. 60 m
D. 100 m
E. 360 m
Answer: B
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Discuss the source of energy for a star like the Sun when it is on the Main Sequence. Include the role of nuclear, electrical, and gravitational forces, temperature, and chemical composition
How long can this star burn its fuel and what marks the end of this stage of its life?
Two cylinders made of the same material roll down a plane inclined at an angle ? with the horizontal. Each travels the same distance. The radius of cylinder B is twice the radius of cylinder A. In what order do they reach the bottom?
a. A reaches the bottom first because it has the greater acceleration. b. A reaches the bottom first because it has a smaller rotatinal inertia. c. B reaches the bottom first because is experiences a larger torque. d. B reaches the bottom first because it travels a larger distance in one rotation. e. They both reach the bottom at the same time, because each has the same linear acceleration.
The concept of matter waves reflects the observation that particles such as electrons sometimes act like ______________
Fill in the blank(s) with correct word
In a laser
a. light is amplified by stimulated emission of radiation b. the emitted light is monochromatic c. the emitted light is coherent d. there is a population inversion of electrons in atoms e. all of the above