The Moon's Distance from Earth Is Measured Very Accurately by Bouncing

question 41

Multiple Choice

The moon's distance from Earth is measured very accurately by bouncing a laser beam off of a small mirror left on the surface of the moon.If a laser is fired at the moon and the signal returns in 2.6 seconds,what is the distance to the moon? (Hint: speed of light c = 300,000 km/s)

• A) 390,000 km
• B) 390,000 m
• C) 780,000 km
• D) 780,000 m

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Definitions:

Messenger RNA

A type of RNA that conveys genetic information from DNA to the ribosome, where it serves as a template for protein synthesis.

Cytoplasm

A jelly-like substance within a cell that contains the organelles, enclosed by the cell membrane.

Ribosomes

Cell organelles responsible for protein synthesis.

Nucleus

The membrane-bound organelle in eukaryotic cells that contains the genetic material.