Why do stars twinkle

1 answer:

4 0

As light from a star races through our atmosphere, it bounces and bumps through the different layers, bending the light before you see it. Since the hot and cold layers of air keep moving, the bending of the light changes too, which causes the star's appearance to wobble or twinkle.

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A shield of material that reflects neutrons is placed around a radioactive sample. Which change in the nuclear reaction is most

Crazy boy [7]

Answer:

A chain reaction will be sustained in a sub-critical mass.

Explanation:

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3 0

1 year ago

The earliest radio broadcasts on Earth were emitted about 100 years ago. Approximately where are these initial radio waves now?

Gala2k [10]

Answer:

100 ly are $d=9.454255\times10^{17}m$

Explanation:

The speed of light is, by definition (we define this and derive a definition of distance from there nowadays), c=299792458m/s. We want to know, at this speed, how much distance the radio signals travel in 100 years. Since each year has 365 days (not a leap one though), each day has 24 hours, each hour has 60 minutes and each minute has 60 seconds, the number of seconds in a year will be (365)(24)(60)(60)=31536000, so the distance traveled by the waves in 100 years will be:

$d=vt=(299792458m/s)(100)(31536000s)=9.454255\times10^{17}m$ , which, of course, are 100 light years.