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shortcake1970

  • 3 years ago

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

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

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

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

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

  5. shortcake1970
    • 3 years ago
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    Thank you!

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