Nat Sci 1 - Ll2 Last Group Assignment

The Last Group Assignment shall be posted tomorrow. ^_^

Nat Sci 1 - Ll2 Powerpoint file on sound wave

To download the powerpoint file that I was using on our last topic, please click either of these:
1. For 2010 format, click  here.
2. For 2003 format, click here
Note:
*If you are using Microsoft Office 2010, choose 2010 format, otherwise choose 2003.
*These are all compressed  (so that I could upload it easily). To view it, you should extract it first e. g. using WinRAR.
*The video clips may not work because they were hyperlinked to the original file in my computer. Nevertheless, the video clips I've shown you in the last 4 slides are extracted from a youtube video uploaded by Pauli1982, shown below.

Nat Sci - Ll2 Last Assignment

Answer the following.
I. Show your solutions.
1. What is the frequency, in hertz, that corresponds to each of the following periods? (a) 0.10 s (b) 5 s.
2. What is the period, in seconds, that corresponds to each of the following frequencies? (a) 10Hz, (b) 0.2 Hz.
3. (a) What is the wavelength of a 340-Hz tone in air? (b) What is the wavelength of a 34,000-Hz ultrasonic wave in air?
4. While playing a game in a golf course, a friend of yours is 408 m away from you. You shout at her saying her name “Jayne!” How long will it take before she hears her name?
II. In your own words, concisely discuss the following.
1. If the Moon blew up, why would we not hear it? (Hint: Sound wave needs medium so that it can travel.)
2. What happens to the wavelength of sound as the frequency increases?

My first try in writing mathematical formula in this blog

Fascinated by a way to write formula in blogspot.com, here's my very first.
The codes used are based on the LATEX and simulated via java extension file installed in this blog. ^_^
 $latex \displaystyle S(n)=\sum_{k=1}^{n}{\frac{1}{T_{k}}=\sum_{k=1}^{n}{\frac{6}{k(k+1)(k+2)}$

Nat Sci 1 - Ll2 Assignment on waves

Hi!

When I printed out the Assignment on Light waves this morning, I didn't examine if it were clear enough. And I have already distributed all the copies to all of you before I could realize that it was NOT really good (blurred, in other words). Sorry for that, guys.

Hence, I am uploading the screen shot of the original copy.

Note:
*Hint for question 3: consider the speed of laser light to be a constant (300,000,000 m/s) and that the distance between the moon and the Earth is 384,403,000 m.

*In question no. 4, c stands for the speed of light, f for frequency, and the symbol next to letter "f" in the equation is the greek letter lambda, notation for wavelength.

*In question no. 5, nm is a shorthand notation for nanometer.

To all my Phys 21.1 classes

To Phys 21.1 - mn, op, and qr,

Please be informed that we will not meet on December 15, 2012 (Saturday) because of the MSU-Main's Commencement exercise. All instructors are required to attend the important event.

We will resume on January 12, 2012.

Have a happy vacation, guys!

See you next year!

To HADJI ASIS, Hayamerah

I have already took note of your name. Please give me some time to find your record. As we were expecting the typhoon Pablo's arrival last week, I hastily put all my papers and records to a spot where it wouldn't get wet. Unfortunately, I wasn't able to arrange it in good order.

Once I find it, I will post right away what you lack according to that record.

Pablo is hopefully all gone

Good day everyone!

I hope everyone is okey. Starting at the early hours yesterday, we've experienced continuous rain accompanied by strong wind. Electricity went out, trees were falling here and there, the roads were filled with debris. We were truly hoping that we might not experience the same intense tragedy we've experienced last year (brought by Sendong).

Last year, it was really complete misery. In my case, we woke up at early dawn in our room to a 1 foot deep water. And when we went outside, most people were bereaving over the deaths of their relatives. That was really unforgettable.

And All Thanks to God, as I look at it, there's not much damage around here (at least here in the place where we live) this time.

Our sincere condolence to those kababayan who lost their relatives in this Pablo incident.

May the Almighty give us all strength to move forward.

Wishing you your well-being, my students.

So, see ya soon.

Another Announcement

To Phys 11.1 - MN and Nat Sci 1-Ll2 students,
Please be informed that we will not meet on Dec 5 (Wednesday).

Phys 11.1 students, please pass your Lab Act no. 1 to ma'am Edna at room 227.

Nat Sci 1 students, we'll resume on Dec 8. And I would like also to inform you in advance that our Prelim Exam will be on Dec 19 (Wed).