Answer:
28.796 J
Explanation:
I hope that it's a correct answer.
Group 0 - they are called the NOBLE GASES
(as they're very unreactive) because...
ALL of their atoms are full.
Example : Helium contains 2 electrons so it's outer shell is full
The speed of sound in air doesn't depend on the frequency of the sound. It depends on the temperature, pressure, and humidity of the air. It's usually around <em>340 m/s</em> .