A radio station broadcasts at 80 MHz. How long does it take for this radio signal to travel a distance of 20 × 106 m?
A) 0.15 × 10-2 s
B) 15 ms
C) 6.7 × 10-2 s
D) 20 ms
E) 25 ms
C
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For dilute concentrations of point defects, the scattering distance for free electrons is _________related to the concentration of point defects.
Fill in the blank(s) with the appropriate word(s).
Kuiper belt objects are small, rocky bodies orbiting beyond Mars
a. True b. False Indicate whether the statement is true or false
Which of the following would count as a hyperspace?
A) a space in which locating a point requires stating four coordinates B) the surface of a sphere C) a line D) a point E) any space that is moving very quickly
Two cars, one in front of the other, are traveling down the highway at 55.0 m/s. The car behind sounds its horn, which has a frequency of 530 Hz. What is the frequency heard by the driver of the lead car? (vsound = 340 m/s)
a. 382 Hz b. 735 Hz c. 456 Hz d. 530 Hz e. 632 Hz