PhysicsThe wavelength of light is 589 nm. What is its order of magnitude in metres?

The wavelength of light is 589 nm. What is its order of magnitude in metres?


  1. A
    5.89×10-7m
  2. B
    5.89×10-6m
  3. C
    5.89×10-12m
  4. D
    5.89×10-5m 

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    Solution:

    :
    Concept: Since the supplied wavelength is a very small quantity, its magnitude is expressed in a very small unit. We can determine how many parts of a metre the unit represents by looking at the prefix preceding the metre. The provided number's base-10 portion indicates the order of magnitude.
    The size of a number expressed in base ten units is its order of magnitude. The portion of the number in base ten units is hence the order of magnitude.
    1 nm=10-9nm  So,589 nm=589×10-9m589 nm=5.89×10-7m
    Order of magnitude is 5.89×10-7m
    So, the correct answer is 5.89×10-7.
    Hence, the correct answer is option 1.
     
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