9
AssignmentMultiple Choice

Unit Test

Question 9 • *25-26 KCS18 Chemistry IC

The Large Hadron Collider is a particle accelerator that may be able to provide insight into the most fundamental structure of matter. It is 27 km long. If one wavelength of red light is 650 nm, how many wavelengths does a photon of red light travel when it passes from one end of the collider to the other? (Note: 1 m = 1 x 109 nm, 1 km = 1,000 m.)

Answer
A
4.2 × 1010 wavelengths
B
2.4 × 1013 wavelengths
C
1.8 × 10–8 wavelengths

Explanation

Convert the collider’s length to nanometers: 27 km × 1,000 m/km × 1 × 10⁹ nm/m = 2.7 × 10¹³ nm. Divide by the wavelength, 650 nm: (2.7 × 10¹³) ÷ 650 ≈ 4.2 × 10¹⁰ wavelengths. So the correct choice is A, 4.2 × 10¹⁰ wavelengths.

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