pick from the following.
(1). wind
(2). energy
(3). waves
(4). sound
(5). Injury
(6). ice
(7). Energy.
(8). heat
Q: Fact 1: Blowing air into a whistle causes air to vibrate inside the whistle. Fact 2: Sounds are vibrations in air. Given the two facts above, what does blowing into a whistle cause?
A:
(4).