A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. A uniform electric field is also present. Due to the combined effect of both fields, the particle does not change its velocity
What is the direction of the electric field? A) along the -y-axis
B) along the +y-axis
C) along the -x-axis
D) along the +x-axis
E) along the -z-axis
B
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A Young's double-slit apparatus is set up. The source wavelength is 424 nm, and the double-slit spacing is 0.0560 mm. At what distance from the double slits should the screen be placed if the spacing between alternating bright fringes is to be 1.60 cm? (1 nm = 10?9 m)
a. 211 m b. 2.11 m c. 0.825 m d. 279 m e. 2.11 m
The statement that objects dropped from above the surface of Earth fall to the surface is
a. probably true, but we'll have to observe it next time to be sure it's true. b. scientific truth, accepted as gospel. c. probably true on Earth and on other planets as well. d. only true if we look at the object while it falls. e. proven true by scientific experiments.
The rate of flashing of a pulsar is a measure of its ________
Fill in the blank(s) with correct word
A person throws a ball horizontally from the top of a building that is 24.0 m above the ground level. The ball lands 100 m down range from the base of the building. What was the initial velocity of the ball?
A) 202 m/s B) 9.80 m/s C) 19.6 m/s D) 45.2 m/s E) 94.4°