Homework Help: chemistry

Posted by tresha on Monday, June 20, 2011 at 6:13pm.

space probe Pioneer 11 was lanced April 5, 1973, and reached Jupiter in Dec.1974 traveling a distance of 998 km. How long did it take an electromagnetic signal to travel to earth from pioneer 11 when it was near jupiter?

chemistry - DrBob222, Monday, June 20, 2011 at 7:06pm
I believe you have made a typo. Surely it is further than 998 km from earth to Jupiter.
chemistry - Dr Russ, Tuesday, June 21, 2011 at 3:49am
Lets take the worst case using the aphelion distance of 816,500,000 km (I have no idea where 998 km comes from - closest approach of Pioneer 11?)

Speed of light is 299,800,000 m s^-1 or 299,800 km s^-1

so time taken for signal to reach Earth (note capital letter for a planet) is

816,500,000 km / 299,800 km s^-1

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