tag:blogger.com,1999:blog-38010166155267773802012-02-16T05:25:00.336-08:00M.P.http://www.blogger.com/profile/15931410112482567049noreply@blogger.comBlogger41100tag:blogger.com,1999:blog-3801016615526777380.post-62254641883026703282009-07-31T00:07:00.000-07:002009-07-31T00:27:19.045-07:00<a href="http://i.ehow.com/images/GlobalPhoto/Articles/5005084/186929-main_Full.jpg"><img style="FLOAT: left; MARGIN: 0px 10px 10px 0px; WIDTH: 219px; CURSOR: hand; HEIGHT: 79px" alt="" src="http://i.ehow.com/images/GlobalPhoto/Articles/5005084/186929-main_Full.jpg" border="0" /></a><br /><div></div><div></div><div></div><div></div><div></div><div> </div><div> </div><div> </div><div> </div><div>We see barcodes everyday and almost every where.</div><div></div><div>Before the invention of barcodes, cashiers at stores have to run their deft little fingers across the cash machines to register payment.</div><div></div><div> </div><div>Now, they just have to beep all items under their scanners. What convenience that little piece of black and white stripes sticker provides!!</div><div></div><div> </div><div>Recall what you've learnt under the topic Light - how does an object appear white / red / black?</div><div></div><div> </div><div>When white light shines on an object and it reflects the whole spectrum into our eyes, we'll see white. On the other hand, if the object absorbs all light and reflect none, we'll see it as black.</div><div></div><div> </div><div>Barcode makes use of the different reflective behaviour of black and white surfaces to transmit data. A scanner (usually we just see a thin ray of red line flashing on the barcode) will record the pattern of reflection from the barcode and send it to a reader in the cashier.</div><div></div><div> </div><div>Imagine the snaking queue we have to endure without those clever little barcode stickers!</div><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3801016615526777380-6225464188302670328?l=sciencebeyondclassroom.blogspot.com' alt='' /></div>M.P.http://www.blogger.com/profile/15931410112482567049noreply@blogger.com0tag:blogger.com,1999:blog-3801016615526777380.post-65488861605616989022009-07-28T19:54:00.000-07:002009-07-28T20:16:43.351-07:00<a href="http://thumbs.dreamstime.com/thumb_354/123204120239SfHF.jpg"><img style="FLOAT: left; MARGIN: 0px 10px 10px 0px; WIDTH: 322px; CURSOR: hand; HEIGHT: 251px" alt="" src="http://thumbs.dreamstime.com/thumb_354/123204120239SfHF.jpg" border="0" /></a><br /><div>A student questioned, "If light travels in a straight line, why is rainbow curved?"<br /><br /></div><div>This student believed that rainbow streams from the sun, like sun ray. </div><br /><div></div><br /><div>That's not true.<br /><br /><br /><br /></div><div></div><div></div><div> </div><div> </div><div> </div><div> </div><div> </div><div> </div><div> </div><div> </div><div> </div><div> </div><div>Sunlight travels in a straight line, "bounced off" rain drops through total internal reflection and the dispersed light spectrum travels in straight line into our eyes.<br /><br /><a href="http://www.glenbrook.k12.il.us/GBSSCI/PHYS/class/refrn/u14l4b3.gif"><img style="FLOAT: left; MARGIN: 0px 10px 10px 0px; WIDTH: 511px; CURSOR: hand; HEIGHT: 236px" alt="" src="http://www.glenbrook.k12.il.us/GBSSCI/PHYS/class/refrn/u14l4b3.gif" border="0" /></a><br /><br /><br /></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div> </div><div> </div><div> </div><div> </div><div> </div><div> </div><div> </div><div> </div><div> </div><div> </div><div>Till now, scientists have not fully understood all aspects of rainbow. </div><div>Rainbow, by itself, is an interesting field of study.<br /><br /><br />To know more about rainbow, check out the two clips below:<br /><br /><br /><embed src="http://www.youtube.com/v/r_hFjFM91C4&amp;hl=" width="425" height="344" type="application/x-shockwave-flash" fs="1&amp;" allowfullscreen="true" allowscriptaccess="always"></embed><br /></div><br /><p><br /><embed src="http://www.youtube.com/v/AZsuZL89Tcs&amp;hl=" width="425" height="344" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" fs="1&amp;"></embed> </p><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3801016615526777380-6548886160561698902?l=sciencebeyondclassroom.blogspot.com' alt='' /></div>M.P.http://www.blogger.com/profile/15931410112482567049noreply@blogger.com0tag:blogger.com,1999:blog-3801016615526777380.post-65728196460975429862009-07-27T23:01:00.000-07:002009-07-27T23:15:15.878-07:00Shadows are formed because light travels in a straight line.<br /><br />I showed my class this video last week while teaching them the properties of light.<br /><br />Who would have known shadows can be so inspiring. Enjoy!<br /><br /><object width="560" height="340"><param name="movie" value="http://www.youtube.com/v/dOupci3zUIs&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/dOupci3zUIs&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="560" height="340"></embed></object><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3801016615526777380-6572819646097542986?l=sciencebeyondclassroom.blogspot.com' alt='' /></div>M.P.http://www.blogger.com/profile/15931410112482567049noreply@blogger.com0tag:blogger.com,1999:blog-3801016615526777380.post-51438060341726834682009-07-27T20:13:00.000-07:002009-07-27T20:14:32.582-07:00Thank you for dropping by.<br />In the days to come, hope you can learn something from this blog.<div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3801016615526777380-5143806034172683468?l=sciencebeyondclassroom.blogspot.com' alt='' /></div>M.P.http://www.blogger.com/profile/15931410112482567049noreply@blogger.com0