Extinction by the Interstellar Medium Dims Starlight by About 2

question 30

Multiple Choice

Extinction by the interstellar medium dims starlight by about 2 magnitudes for every 1,000 pc the light travels.If a star is observed to have a magnitude of 7,and it is determined to be at a distance of 2,000 pc,what would the magnitude be if there was no extinction?

• A) 7
• B) 1.75
• C) 28
• D) 11
• E) 3

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