Posted by **Lizzy** on Sunday, November 20, 2011 at 11:09pm.

If the distance from the Earth to the moon is 3.84 x 105 km. How long would it take a radio wave with wavelength 413.8 m to travel from Earth to the moon?

C=(lanbda)v & E=(h)v

- Chemistry -
**DrBob222**, Sunday, November 20, 2011 at 11:19pm
You don't need either of these equations.

The speed of the radio wave is 3E8 m/s. You have a distance of 3.85E8 meters (note I converted from km to m).

distance = rate x time.

You have distance, you have rate (3E8 m/s), solve for time in seconds.

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