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Thread: Beam of Light

  1. #1
    Super Member harpazo's Avatar
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    Beam of Light

    How long does it take a beam of light to reach Earth from the Sun when the Sun is 93,000,000 miles from Earth? Express your answer in seconds, using scientific notation.

    1. I know there are 5,280 feet in one mile.
    2. The distance given is 93,000,000 miles. Must I use
    the distance formula D = rt. If so, is t for time in hours?
    3. Must I convert 93,000,000 to scientific notation as a first step?
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    Re: Beam of Light

    Do you know the speed of light?
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    Super Member harpazo's Avatar
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    Re: Beam of Light

    Quote Originally Posted by Debsta View Post
    Do you know the speed of light?
    I am not familiar with the speed of light. I can look it up online, though. What must I do with the speed of light here?
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    Re: Beam of Light

    Quote Originally Posted by harpazo View Post
    I am not familiar with the speed of light. I can look it up online, though. What must I do with the speed of light here?
    That's your rate.
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    Super Member harpazo's Avatar
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    Re: Beam of Light

    Quote Originally Posted by Debsta View Post
    That's your rate.
    What exactly are you saying? Are you saying to divide 93,000,000 by the speed of light?
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    Super Member harpazo's Avatar
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    Re: Beam of Light

    The speed of light is 186,000 miles per second.

    So, 93,000,000 186,000 = 500 seconds.

    In scientific notation, 5 X 10^2 seconds.

    Is this right?
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    Forum Admin topsquark's Avatar
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    Re: Beam of Light

    Quote Originally Posted by harpazo View Post
    The speed of light is 186,000 miles per second.

    So, 93,000,000 186,000 = 500 seconds.

    In scientific notation, 5 X 10^2 seconds.

    Is this right?
    Yup, though you probably ought to include at least one more significant digit in there.

    -Dan
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    Super Member harpazo's Avatar
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    Re: Beam of Light

    Quote Originally Posted by topsquark View Post
    Yup, though you probably ought to include at least one more significant digit in there.

    -Dan
    Ok. Good to know I got it right.
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