When we look at an object that is 1,000 light-years away we see it
A) as it was 1,000 years ago.
B) as it was 1,000 light-years ago.
C) as it is right now, but it appears 1,000 times dimmer.
D) looking just the same as our ancestors would have seen it 1,000 years ago.
A
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Consider an experiment where we send monochromatic light to a distant screen through a single narrow slit. The distance between adjacent dark fringes in the diffraction pattern displayed on the screen (A) increases, (B) decreases, or (C) remains the same if, The intensity of the light increases
A. Increases B. Decreases C. Remains the same
If a star exhibits no Doppler shift in its emitted light, it must be true that ________.
A. the star is neither moving toward nor away from Earth B. the star is not moving relative to Earth C. the star does not emit much visible light D. the star only displays proper motion
A runaway railroad car, with mass 30 × 10^4 kg, coasts across a level track at 2.0 m/s when it collides with a spring-loaded bumper at the end of the track. If the spring constant of the bumper is 4.0 × 10^6 N/m, what is the maximum compression of the spring during the collision? (Assume the collision is elastic.)
a. 0.77 m c. 0.34 m b. 0.55 m d. 1.07 m
How is a constellation different from an asterism?
What will be an ideal response?