A Ruby Laser Can Deliver an 8

question 16

Multiple Choice

A ruby laser can deliver an 8.57 J pulse in approximately 50 nanoseconds.The wavelength of the light is 694.4 nm.At least how many atoms within the ruby rod had to be excited to allow this high-energy laser pulse? (h = 6.63 x 10^-34 J*s,c = 3.00 ´ 10⁸ m/s,1 eV = 1.6 x 10^-19 J,and 1 nm = 10^-9 m)

• A)4 x 10¹⁸
• B)8 x 10¹⁸
• C)3 x 10¹⁹
• D)6 x 10²⁰

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