A heater is rated at 1200 watts for a 120-volt source.The resistance of the heater is 10 ohms
a. True
b. False
Indicate whether the statement is true or false
False
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Equal wavelength waves of amplitude 0.25 m and 0.10 m interfere with one another. What is the resulting minimum amplitude that can result?
a. 0.15 m c. 0 m b. 0.10 m d. –0.40 m
A pulsar emits bursts of radio photons
a. True b. False Indicate whether the statement is true or false
If the z-component of the magnetic field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation Bz(x, t) = (1.25 ?T) cos[(3800 m-1)x - (1.14 × 10-12 rad/s)t],
what is the largest that the y component of the electric field can be? (c = 3.0 × 108 m/s) A) 375 N/C B) 4.17 × 10-15 N/C C) 3.75 × 108 N/C D) 4.17 × 10-9 N/C E) 1.25 × 106 N/C
Meteorites are valuable to astronomers because:
A) they may provide evidence about the process in which the solar system was born. B) they originated in other solar systems. C) they contain diamonds and gold. D) they reveal the contents of interstellar space. E) they prove that life can only exist on the Earth.