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-Why can't we be certain that the Andromeda Galaxy exists today? -How do sound and light waves...

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Physics

-Why can't we be certain that the Andromeda Galaxy existstoday?

-How do sound and light waves differ?

-What is the frequency of a radiowave that has a wavelength of λ = 100 m?

-Which of these is the same for allforms of electromagnetic (EM) radiation in a vacuum (i.e., emptyspace)?

wavelength,frequency, velocity, photon energy

-Which of these is emitted when anelectron falls from a higher to lower orbital?

another electron, a positron, aneutrino, a photon

Answer & Explanation Solved by verified expert
4.2 Ratings (817 Votes)
Why cant we be certain that the Andromeda Galaxy exists today Ans As we know Information moves at the speed of light in this universe No getting around that Therefore there is no common now with us and the Andromeda galaxy the now is separated by two million years    See Answer
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