A Ruby Laser Delivers a 2

question 30

Multiple Choice

A ruby laser delivers a 2.28-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 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,1 eV = 1.6 × 10−¹⁹ J,and 1 nm = 10−⁹ m)

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

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Market Price

The current price at which an asset or service can be bought or sold in a given market.

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A mathematical representation showing how the cost of producing one additional unit of a good changes as the quantity of production varies.

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