Double-slit electron diffraction

June 22, 2010

The French physicist Louis de Broglie proposed in 1924 that electrons and other discrete bits of matter, which until then had been conceived only as material particles, also have wave properties such as wavelength and frequency. Later (1927) the wave nature of electrons was experimentally established by C.J. Davisson and L.H. Germer in New York and by G.P. Thomson in Aberdeen, Scot. To explain the idea, to others and themselves, physicists often used a thought experiment, in which Young’s double-slit demonstration is repeated with a beam of electrons instead of light. Obeying the laws of quantum mechanics, the stream of particles would split in two, and the smaller streams would interfere with each other, leaving the same kind of light- and dark-striped pattern as was cast by light. Particles would act like waves. According to an accompanying article in Physics World, by the magazine’s editor, Peter Rodgers, it wasn’t until 1961 that someone (Claus Jönsson of Tübingen) carried out the experiment in the real world.

Source: http://physics-animations.com/Physics/English/top10.htm

Periodic Table

June 20, 2010

The periodic table is the most important reference a chemist has because it puts all the known elements into a meaningful pattern. Elements are arranged left to right and top to bottom in order of increasing atomic number. This order generally goes with increasing atomic mass.

Click on an element for more information(you will be leaving this site and going to the Los Alamos National Laboratory site):

The different rows of elements are called periods. The period number of an element signifies the highest energy level an electron in that element occupies (in the unexcited state). The number of elements in a period increases as one moves down the periodic table because as the energy level of the atom increases, the number of energy sub-levels per energy level increases.

In 1869, the Russian chemist Mendeleev noted that the repeating patterns of behavior could be arranged in a sequence of elements. This led to the first “Periodic Table” of the elements.

Scientists and students who are familiar with the periodic table use the position in the table to extract information about individual elements.

Chemistry in a Nutshell

For a list of the element names and symbols in alphabetical order.

If teachers are so important

June 12, 2010

Effective teachers are the key to student success. Yet our school systems treat all teachers as interchangeable parts, not professionals. Excellence goes unrecognized and poor performance goes unaddressed. This indifference to performance disrespects teachers and gambles with students’ lives.

more…

Journal of Physics Teacher

June 7, 2010

Journal of Physics Teacher Education Online — Main Page – [ Terjemahkan laman ini ] 8 Mar 2010 … Dedicated to investigating and documenting significant issues and challenges in the education of physics teacher candidates. http://www.phy.ilstu.edu/jpteo/ – Tembolok – Mirip

Big Books by Title

June 3, 2010

Anno’s Counting Book Big Book by Mitsumasa Anno
Bear’s Bargain (Big Book) by Frank Asch
Big Blue Whale Big Book (Read and Wonder) by Nicola Davies
Big Red Barn Big Book by Felicia Wise Brown
Bread and Jam for Frances Big Book by Russell Hoban
Brown Bear Brown Bear What Do You See by Bill Martin, Jr.
Brown Bear, Brown Bear, What Do You See?: 40th Anniversary Edition by Bill Martin, Jr.
Cactus Hotel (Big Book) by Brenda Z. Guiberson
Can’t You Sleep, Little Bear? by Martin Waddell
Caps for Sale Big Book (Reading Rainbow Book) by Esphyr Slobodkina
Children of the Sun (Giant Edition) (Information Books) by Art L’Hommedieu
Chrysanthemum Big Book by Kevin Henkes
Corduroy by Don Freeman
The Cow That Went OINK by Bernard Most
Crazy Hair Day Big Book by Barney Saltzberg
Curious George by H.A. Rey
Dear Zoo (Big Books) by Rod Campbell
Dinosaurs, Dinosaurs Big Book by Byron Barton
Don’t Forget the Bacon! Big Book (Mulberry Big Books) by Pat Hutchins
The Doorbell Rang Big Book (Mulberry Big Book) by Pat Hutchins
Each Orange Had 8 Slices Big Book (Mulberry Big Books) by Paul Giganti
Eating the Alphabet: Fruits & Vegetables from A to Z (Harcourt Brace Big Book) by Lois Ehlert

Physics is Phun!

June 1, 2010

Call for papers APS 2010

May 31, 2010

Call for papers  APS 2010
The 4th Asian Physics Symposium
Bandung, Indonesia

Background

Physics is the most fundamental of all the natural sciences, and its applications extend even to other areas of human endeavor. It is the study of the natural world based on quantitative observations and experiments. Physics attempts to discover simple rules by which observations of many different situations can be correlated within a common framework of fundamental ideas. Physical laws and the framework in which they are used have profound influence on how we view our universe and ourselves. The Physics Study Program, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung has organized the biannual Asian Physics Symposium since 2005, which is the extension of the annual meeting named
Annual Physics Seminar since 2001. Motivated by the encouraging results of and responses to those events, we have decided to continue this meeting this year. To be exact, we are now in the process of preparing the 4th Asian Physics Symposium (APS 2010)  in Bandung.

more: portal.fi.itb.ac.id

teach problem microscope

May 20, 2010

If you are a teacher currently teaching in class eight junior high schools but now of course, teach problem microscope. Here there is a good flash file for use in teaching ana. Enjoy

DOWNLOAD

Virtual physics

May 6, 2010

Virtual physics is the collection of programs simulating physical phenomena. They can be used as demonstration tools at school or for individual studies and experiments at home.

See what you can never see in nature!

The most exiting feature of Virtual Physics is that you can perform and observe many experiments you can never see either in nature or in the school laboratory, eg. stars moving on their orbits or the motion of the molecules of gas.

On one matter which appears on the 2010 exam yesterday

May 4, 2010

On one matter which appears on the 2010 exam yesterday.
7. Consider the following events!
1. Mangoes in free fall to earth
2. Ball rolling in the sand
3. Marbles rolling down the incline and slippery
4. The bullet fired vertically upward.
Examples of uniformly accelerated motion to change the straight truth is …
A. 1 and 2
B. 1 and 3
C. 2 and 3
D. 2 and 4

Solutions
To answer the questions above, then we should be able to classify where straight-line motion where the motion of uniform and uniformly turn right straight
1. Straight change uniformly accelerated motion
2. Straight changing irregular motion is slowed
3. Straight change uniformly accelerated motion
4. Straight changing irregular motion is slowed
The answer is the first and third