imagine that an explosion on the moon produced sound waves the light waves . would both kinds of wave reach an astronaut in a spaceship flying nearly in empty space ? would the astronaut therefore see and hear the explosion? explain why or why not.

yes, he would see the light first, depending on distance he might hear it but might not notice it.

Explanation: light travels lightyears away and is seen rather quickly. sound waves are much slower but you can hear it.

the answer to your question is c

a electronegativity decreases beacuse the size of nucleus is bigger.