ACB

1450 – 344 = 1106 m/s faster

About 4 times faster (1450 / 344)

About 15 times faster (5200 / 344)

No, sound cannot exist in a vacuum. Sound requires a medium to travel. Since there is no air in a vacuum, vibrations and sound cannot be produced.

Answers

Answers:1. Sound waves with frequencies below 20 Hz are infrasonic.

2. Sound waves with frequencies above 20,000 Hz are ultrasonic.

3. The animals that can hear sounds at infrasonic frequencies include: elephants and cattle

4. The animals that can hear sounds at ultrasonic frequencies include: cats, dogs, horses, cattle, bats, whales, and dolphins

5. Waterfalls could be helpful because hearing would be one way to for animals to find a source of water.

6. Whales and dolphins have the greatest frequency range of hearing?

7. True: Elephants can ear hear frequencies below the human hearing range, but cannot hear sounds with higher frequencies than humans can.