A typical helium-neon laser found in supermarket checkout scanners emits 633-nm-

Question

A typical helium-neon laser found in supermarket checkout scanners emits 633-nm-wavelength light in a 1.5-mm-diameter beam with a power of 1.5 mW ooo MetroPCS F 10:27 PM session masteringphysics.com Problem 25.29 MasteringPhysics A typical helium-neon laser found in supermarket checkout scanners emits 633-nm-wavelength light in a l.5-mm-diameter beam with a power of I.5 mw Part A What is the amplitude of the oscillating electric field in the laser beam Express your answer with the appropriate units. Value Units Eo Submit Give Up Part B What is the amplitude of the oscillating magnetic field in the laser beam Express your answer with the appropriate units. Bo Value Units Submit Give Up Continue

Explanation / Answer

I = P/A = P /pi*r^2 = 1.5x10-3/ pi*[0.75x10-3]2 = 848.826 W/m^2

electric field amplitude:

E = sqrt[2I/e0c] = sqrt[2*848.826 / 8.85x10-12*3x108] = 799.635 N/C

Maximum magnetic field:

B = E/c =  799.635 N/C / 3x108 = 2.665e-6 T

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.