Answers!

I am here... once again, to blog. For some odd reason, I still don't get why all the language when i log onto blogger, is in hangul (korean)... I really just don't get it. But whatever. And just to inform you, I didn't not change my name (Mr.Lawrence --> Rence) in an attempt to dodge bloggin today. And on another note, I so did not break the hammer on purpose. The energy from the tuning fork just happend to bounce back and release some force back into the hammer then... snap. So, yeah haha.

Anyways, today we basically jsut corrected answers so I'll start w/ the ones from the yellow booklet.

8.
a) Intensity = energy transported past a given area /time. Objective number. Loudness = depends on the amplitude of the wave.
b) Frequency = vibrations per second *Objective measure* Pitch = Perception of sound *subjective*

Note: Objective means that its non selective while subjective means its selective hearing, etc. For example, volume on a television might be louder to one person compared to another person.

9) 20Hz -> 20, 000 Hz. The range is called the audio spectrum

10)
a) 5 Hertz
b) t=1/f=1/5=0.2 seconds.

Thats that for the yellow booklet. Then we went over the worksheet we had to do over the weekend.

Worksheet answers:

1) 344 m/s

2) air = 340.4 m/s wood = 4000m/s vwood/vair = 4000 m/s /340.4m/s = 12x faster in wood.

3) a) 4.1km b) 4.16km c)4.31km d) 4.01km

4) wavelength = 0.38cm

5) 640m

6) 13.3 C

7)a)347m/s b)323m/s

8) 344.6m/s

And that's about it for today's blog. We also got handed out a sheet of five questions. You only have to do the first four, but if you feel like having a crack at number five, by all means. G'niight all. I gotta stop staying up so late.

--Rence

P.S. The next blogger will be... *Throws pokeball* Francis, I choose you!