Anyways, here's what we did in class today. We got the Sound Waves worksheet handed back to us from the 15th. We also watched the laser disc slide thinger again and wrote a sentence for each chapter we watched as a sort of guideline for the test.
We went over the answers for questions 1, 2, 6, 11, 14, 17, 18 and 19 and also did a lab. Our lab was Making a Straw Oboe, and basically we snipped the flatten end of a straws to make it pointed and blew through them to make a sound. (which got very annoying at the end by the way *ahem, ahem*) =P
The lab worksheet is due tomorrow, don't forget to do it.
Oh and here are the answers to the questions in our yellow booklets (again.. because I'm sooo nice)
1. Animals that rely on an acute sense of hearing for survival often have large external ear parts. The large ears intercept and direct more of the sound energy into the auditory system than small outer ears do.
3. 0 - 3 dB
(10 x 10 x 10 = 1000x)
6. 40 dB -----> 80 dB
40 - 50 = 10x
40 - 60 = 10 x 10
40 - 70 = 10 x 10 x 10
40 - 80 = 10 x 10 x 10 x 10 = 1000x
11. a) 5 seconds b) f = 1/T = 1/5s = 0.2 Hz
14. 440 Hz + 5 = 445 Hz & 436 + 9 = 445 Hz
Frequency = 445 Hz
17. Wavelength increased in water.
18. Lower frequency.
19. Higher frequency.
The next scribe will be Crystal.. only because his name rhymes with Me. haha =)
Alrighty later days. See you folks tomorrow morning.
1 comment:
Thanks for posting the answers and for being so nice. Another post that was written very well.
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