In order for a satellite to be geosynchronous, its orbit must:

a. go over the North and South Poles.
b. be over the equator.
c. be over a single longitude.
d. emit television signals.


b

Physics & Space Science

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The excited state of a certain atom is 3.2 eV ± 0.21 eV. (h = 6.626 × 10-34 J ? s, 1eV = 1.60 × 10-19 J)

(a) What is the average lifetime of this state, in femtoseconds? (b) If the excited energy were doubled (to 6.4 eV ± 0.21 eV), how would the lifetime be affected?

Physics & Space Science

A battery is used to light two bulbs as shown. What happens to bulb B when bulb A is unscrewed from its socket?

Physics & Space Science

The lowest places on Earth's surface are called __________ trenches

a. plateau b. mid-oceanic c. deep-sea d. none of these

Physics & Space Science

What happens when the electron in a hydrogen atom flips its direction of spin, from parallel to anti parallel to that of the proton?

A. Nothing, this transition never occurs. B. The atom emits high-energy ultraviolet rays. C. The atom emits 656-nm radiation that gives red color. D. The atom emits 21-cm radio radiation.

Physics & Space Science