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A Telescope That Uses a Mirror 249 Cm in Diameter

Question 26

Multiple Choice

A telescope that uses a mirror 249 cm in diameter is just able to resolve a double-star system that is 1.5 light-years away. Assume the light from the stars has a wavelength of 691 nm. How far apart are the two stars? One light year = 9.46 × 1015 m. (Use the approximation for θmin: θmin ≈ A telescope that uses a mirror 249 cm in diameter is just able to resolve a double-star system that is 1.5 light-years away. Assume the light from the stars has a wavelength of 691 nm. How far apart are the two stars? One light year = 9.46 × 10<sup>15</sup> m. (Use the approximation for θ<sub>min</sub>: θ<sub>min</sub> ≈ .) A) 9.8 × 10<sup>7</sup> m B) 8.5 × 10<sup>8</sup> m C) 8.5 × 10<sup>9</sup> m D) 9.8 × 10<sup>8</sup> m E) 4.8 × 10<sup>9</sup> m .)


A) 9.8 × 107 m
B) 8.5 × 108 m
C) 8.5 × 109 m
D) 9.8 × 108 m
E) 4.8 × 109 m

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