To determine the orbital period of a visual binary, we must measure
a. brightness.
b. position on the sky.
c. wavelengths.
d. luminosity.
e. temperature.
b
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Which of the following statements is true in the context of visible light spectrum?
A) Red light has more energy than blue light. B) Red light has a higher frequency than blue light. C) Red light has the shortest wavelength that can be seen by the average human eye. D) Red light has the longest wavelength that can be seen by the average human eye.
At what angle, with the surface, must light strike glass (refractive index 1.6 ) in order to completely polarize the reflected ray?
A) 32° B) 86.° C) 34.° D) 11.° E) 56.°
A passenger is on a spaceship traveling at 0.8 c. The passenger observes that her watch
A. is running slow. B. is running fast. C. is keeping time as usual. D. is running slow if the ship is traveling in the positive direction. E. is running slow if the ship is traveling in the negative direction.
The Earth never passed through the cratering stage in planetary development
Indicate whether the statement is true or false