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anonymous

  • 4 years ago

Q: Calculate the energy of a wavelength using this formua: E=h*f Key: E= energy H= Planck's constant (6.626*10^-34) units:js f= frequency Frequecny formula: 3.0*10^8 m/s (speed of light)/ wavelength (630nm) *NOTE: I've already done this, I just need someone to check my work. This is what I did: I found the frequency by: 3.0*10^8 m/s divided by 630nm. I got 476190.4762 for frequency (please help with units, I don't know how to put them together) Then I multiplied plancks constant with the frequency: 6.626*10^-34 * 476190.4762 to get: 15361905 (rounded) as the energy.

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  1. anonymous
    • 4 years ago
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    COULD SOMEBODY PLEASE CHECK MY WORK, I have a lab report and I really want to get this right. :(

  2. phi
    • 4 years ago
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    you should use scientific notation when doing this problem 630 nm = 630 x 10^-9 m = 6.3 x 10^-7 m

  3. phi
    • 4 years ago
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    f= 3.0*10^8/6.3*10^-7 = 4.76*10^14 Hertz (1/sec)

  4. phi
    • 4 years ago
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    so your freq is too small

  5. anonymous
    • 4 years ago
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    So my error is not putting it in scientific notation?

  6. phi
    • 4 years ago
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    E= 6.626*10^-34 J-s * 4.76*10^14 1/sec = 3.15*10^-19 Joules

  7. phi
    • 4 years ago
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    I would not say error. Just very very bad way to do it. (too ugly)

  8. anonymous
    • 4 years ago
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    I won't say I'm not still confused, but thank you for showing me the "easier" way. :D

  9. phi
    • 4 years ago
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    I did not say it was easy. Just easier. First, you change 620 nm (nanometers) to meters. google for definition. you get as above. see if you can follow the arithmetic

  10. phi
    • 4 years ago
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    *630 nm

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