What are cosmic rays?

A) another name for gamma rays and X-rays
B) fast moving dust particles in the interstellar medium
C) subatomic particles that travel close to the speed of light
D) lasers used as weapons by extraterrestrials


C

Physics & Space Science

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Photons of light can be absorbed by an atom of an element ____

a. if they match one of several possible wavelengths that are absorbed by that element b. if they match one of several possible wavelengths that are absorbed by all elements c. if they match the only particular wavelength that can be absorbed by that element d. if they match the only particular wavelength that can be absorbed by all elements e. no matter what wavelength they have

Physics & Space Science

Do you think it is possible that a flare star could harbor an advanced civilization? Explain your reasoning

What will be an ideal response?

Physics & Space Science

Only one of the statements below uses the term theory in its correct, scientific sense. Which one?

A) Einstein's theory of relativity has been tested and verified thousands of times. B) Evolution is only a theory, so there's no reason to think it really happened. C) I have a new theory about the cause of earthquakes, and I plan to start testing it soon. D) I wrote a theory that is 152 pages long.

Physics & Space Science

When a neutron decays to create a proton, another particle emitted is a(n)

a. alpha particle b. beta particle c. gamma ray d. x ray e. none of the above

Physics & Space Science