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shortcake1970

how long does it take light to reach us from the sun, 1.49 X 10 to the 8th km away

  • one year ago
  • one year ago

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  1. shortcake1970
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    a red light has a wavelenght of 620nm. what is the frequency?

    • one year ago
  2. Shadowys
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    you can use v=s/t for the first and \(v=f \lambda\) for the second.

    • one year ago
  3. Shadowys
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    note: light has a speed of \(3 \times 10^8m/s\)

    • one year ago
  4. UnkleRhaukus
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    \[v=\frac dt\quad \implies\quad t=\frac dv\] \[d=1.49\times10^8 [\text {km}]=1.49\times10^{11}[\text m]\]\[v=c=3\times10^8 [\text{m/s}]\]

    • one year ago
  5. shortcake1970
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    Thank you!

    • one year ago
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