Let’s see how much you’ve picked up with these experiments and the reading – answer as best as you can. (No peeking at the answers until you’re done!) Just relax and see what jumps to mind when you read the question. You can also print these out and jot down your answers in your science notebook.
Some of these questions you might recognize from the last lesson on potential energy, but we put them here again so you can see how they are inter-related. Have fun!
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At high latitudes, sensitive radios that are tuned below 5 MHz can detect three different types of radio emissions from the Earth’s ionosphere. While this is normally below the range of human hearing, if you could hear it, it would sound like static bursts and squawks. NASA has been studying these for years: http://istp.gsfc.nasa.gov/istp/news/0112/fall01agu.html
Thank you. I did not know the sun makes noise. Can we hear the northern lights… do they make sound? The Inuit say they can hear it sometimes.
30,000 Hz is usually beyond our ability to hear it – most adults top out around 15,000 Hz because of hearing damage (music was too loud as a teenager, stood too close to a jet engine, hours of rocking screaming babies, etc…) You can translate the 30,000 Hz sound to something within our range and still call it 30,000 Hz, but it’s not a true 30,000 Hz. That’s one way that I have folks ‘hear’ the sound of the sun – I capture the radio range which is at lower frequencies and bump it up to audible range. Does that help?
7. If something is vibrating at 30,000 Hz, can we hear it?
Your answer is no but it seems we can hear it when listening to it on you tube. Why is that?