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mikael mikael
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A   8.0 × 1014 Hz laser emits a  8.2 µs pulse, 5.0 mm in diameter, with a beam energy density of
0.20 J/m3. The number of wavelengths in the length of the beam is closest to: 
A) 6.6 × 109 
B) 2.0 × 1010 
C) 2.0 × 109 
D) 6.6 × 1010 
E) 2.0 × 1011 
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padrepadre
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mikael Author
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10 years ago
Thanks for the homework help on my physics
Anonymous
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#3
A year ago
A 7.8 x 1014 Hz laser emits a 8.7-μs pulse, 5.0 mm in diameter, with a beam energy density of 0.21 J/m3. The number of wavelengths in the length of the beam is closest to:

  • 6.8 x 109
  • 2.0 x 109
  • 2.0 x 1011
  • 2.0 x 1010
  • 6.8 x 1010
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