Bad news, class.

I’m afraid that your Chem201 professor is feeling a trifle under the weather today. It’s the weather change, you know...

Uh, but he told me to tell you guys that the exam is STILL scheduled for next Thursday, and that he expects to have your papers graded and back to you NO LATER THAN the Tuesday before Thanksgiving break.

He also gave me a copy of today’s lecture notes so that you can all stay on top of the material; though, I’ve got to tell you that I’m a little confused by them. I guess you guys know where you’re at more than I do, so I’m just going to read them aloud here, and you can copy what you need, and that’ll be all for the day. Sound good?

Alright then:

11/13 “Half-Life Periods”

- the half-life of a rock ‘n’ roll band whose value decreases with time is the interval required for the quantity to decay to half of its initial value.

- exponential decay can be explained by the following equation:

t1/2= [ln (2)]/[λ]where t

1/2is the half-life, ln(2) is the natural logarithm of 2 (approximately 0.693), and λ is the decay constant.

- The new Weezer record will reportedly be officially released on April 22, 2008, approximately 14 years after the unimpeachably ideal *Blue Album* hit the market.

- A band’s half-life is related to the mean lifetime τ by the following relation:

t_[1/2] = ln (2) x τ .

- This is Weezer’s sixth studio album, the details of which are available at AlbumSix.com. There is no title as of yet.

- Groups that are subject to exponential decay as their careers progress are commonly denoted by the symbol =w=. If the quantity is denoted by the symbol N, the value of N at a time t is given by the formula:

=w=(t) = N_0 e^[- τ t]where =w= is the initial value of N (at t = 0)

- Weezer.com webmaster Karl Koch recently posted his impressions of the recording process online, insisting that the band has "grown into a new land that they had previously only skirted around the edges of - a land where arrangements are getting adventurous, where song structures, lengths and feels are given plenty of sunlight and fresh water and allowed to grow into what the songs demand.”

- When t = 0, the exponential is equal to the level of Karl Koch’s bias, and =w= is equal to N_0. As t approaches infinity, the exponential approaches zero. In particular, there is a time t_*1/2*, such that:

N(t_[1/2]) = N_0 x [1]/[2]

- DON’T FORGET CLASS: Rivers Cuomo’s solo record is due on December 11. NO EXCEPTIONS!!!

Uh, I guess that’s it, class. Have a good weekend, everyone. Oh, and your professor also told me to tell you not to forget that there’ll be extra credit on next week’s test for anyone who can prove algebraically that Weezer won’t continue to BLOW.

Any other questions?