Two pure tones are sounded together and a particular beat ...

[genevieve1028]

Two pure tones are sounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increased?
 
  A) It does not change.
  B) It decreases.
  C) It could either increase or decrease.
  D) It increases.

Question 2

It is unlikely that we will be able to detect the signals from civilizations in other galaxies because
 
  A) signals from other galaxies will be severely weakened by distance, making them far harder for us to detect
  B) other galaxies are unlikely to harbor intelligent civilizations
  C) signals from civilizations on other galaxies will not reach us before we give up listening
  D) they will most likely transmit at wavelengths that will be absorbed by intergalactic gas

[ebe]

Answer to Question 1

C

Answer to Question 2

A

[genevieve1028]

TYSM

[sailorcrescent]

Excellent