A charged particle moves in a straight line through a region of space. Which of the following answers must be true? (Assume any other fields are negligible.) The magnetic field ack;mso-style-textfill-fill-alpha:100.0%'> that is submerged in the water?
1.has a magnitude of zero.
2.has a zero component perpendicular to the particle's velocity.
3.has a zero component parallel to the particle's velocity.
2
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You are in a spaceship traveling away from earth. You and Mission Control on earth agree that the +x direction is the direction in which your ship is traveling relative to the earth. If you choose your own frame to be the Home Frame (so that the earth is the Other Frame), what is the sign of ?, according to the convention established in this chapter?
A. Positive B. Negative C. We are free to choose ? to have either sign.
A wiggle in both space and time is a
A) vibration. B) wave. C) both of these D) neither of these
The interval from new Moon to first quarter is about a(n)
A) hour. B) day. C) week. D) month. E) year.
According to Einstein, increasing the brightness of a beam of light without changing its color will increase:
a. the number of photons. b. the energy of each photon. c. the speed of the photons. d. the frequency of the photons.