Look at the chart that shows the distance of the star Proxima Centauri from the Earth. Distance from Earth to Proxima
Centauri, the next nearest star
~40,000,000,000,000 km
or
~4.24 light-years
Which of the following would be true if Proxima Centauri was one light year closer to the Earth?
A Its brightness in the sky would appear to be the same as it was before.
B Its brightness in the sky would be reduced because of the orbit of other planets.
It would affect the gravitational pull of the Earth's orbit.
D It would look brighter than the sun.

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Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656(red) and 486 (blue). light from a hydrogen lamp illuminates a diffraction grating with 500 lines per mm, and the light is observed on a screen 1.50 behind the grating. what is the distance between the first-order red and blue fringes?