Electromagnetic Radiation with a Wavelength of 471 Nm Appears as Blue

question 35

Multiple Choice

Electromagnetic radiation with a wavelength of 471 nm appears as blue light to the human eye.The energy of one photon of this light is 4.22 × $10 ^ { - 19 }$ J.Thus,a laser that emits $1.3 \times 10 ^ { - 2 } \mathrm {~J}$ of energy in a pulse of light at this wavelength produces ________ photons in each pulse.

• A)1.5 × \(10 ^ { 19 }\)
• B)1.2 × 10^-23
• C)3.2 × \(10 ^ { - 17 }\)
• D)3.1 × \(10 ^ { 16 }\)
• E)6.5 × \(10 ^ { 13 }\)

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Definitions:

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