The speed of light is 3.0 × 10^5 km/s, and it takes 1.3 s for light to travel from the Moon to Earth. From this information, what is the distance to the Moon?
a. 390,000 km
b. 230,000 km
c. 3.9 km
d. 2.3 km
e. 4.3 × 10^5 km
a
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A red-hot piece of coal will cool quicker in a
A) cold room. B) warm over. C) both the same.
A 100. Watt light bulb is powered by 120. v AC, 60. Hz household connection. Determine the rms current and the peak current
What will be an ideal response?
When you send a wave pulse down a rope or Slinky, it eventually dies out. What has become of the energy?
A) It was transformed into electromagnetic energy. B) It was transformed into Italian sausage. C) It was transformed into thermal energy. D) It was transformed into elastic energy. E) It vanished because energy is always lost in all physical processes.
Temperature variation of different parts of a person's body can be detected by analyzing the emission pattern of which type of electromagnetic radiation?
a. microwave b. infrared c. ultraviolet d. x-rays