Recent content by ap_cycles

Hi there, When performing the Young's double slit expt, we always pass the light source through a single slit first before the actual double slits. The typical textbook answer for the use of the first slit is to "produce 2 coherent light sources at the 2 slits", or "to ensure a constant phase...

Dear fellow forummers and Lohrasp in particular, Thanks for the replies. Yes, Lohrasp, you have interpreted my question correctly, and YES, i understood your explanation. Thanks! :biggrin:

Hi, I place an object on a rough surface. It is clear that the static friction will increase as you increase the elevation of the surface since there is a bigger component of weight acting down the plane surface. But will the max static friction -i.e. friction at the verge of slipping...

To Phrak, Dadface, Pengwuino, arildno, Thank you very much for all of your replies! Now i understand... :!)

HI, My question as per above. A quick check with Physicsclassroom.com reveals that a (perhaps too simplistic) reason is that more and more air molecules are hitting the body as the body falls through the air. But i am confused. I thought when the body first falls through the air fluid...

Hi forummers, Can kindly please enlighten me on the post before this? Thanks! ( A high school physics teacher here) - Someone told me this is a good way to solicit response from the forum :-p

Hi all, As sound travels through air, does the air molecules travel with the same speed as well? In other words, if sound is traveling in air at 340m/s, does it also then mean that the mean speed of all the affected air molecules is 340m/s? I personally do not think so. I guess that...

Thank you all for the wonderful replies. Very much appreciated. So can i summarrize my own understanding as shown (pls correct me if there are any mistakes): 1. Upolarized light passing through a single polarizer. Amplitude the same. But intensity is halved. 2. Polarized light...

Hi netheril, I don't quite understnad your reply. If amplitude does not change, how come intensity is reduced by half after passing through the polarizer? (My understanding is that the ratio of 2 intensities - i.e. before or after passing through polarizer intensities - is equal to square of...

Hi all, It is common knowledge that unpolarized light, when passing through an ideal polarizer, suffers a drop of half its original intensity. But since intensity is proportional to square of the amplitude, can we then infer to say that the new amplitude of light through the polarizer is...

Thanks Stonebridge and Studiot. I am starting to see the light. Thank you for your responses. Both of you will make better teachers than me. :rolleyes:

Hi Stonebridge, Thanks for your wonderful insights to Q2. But i am still not fully convinced for Q1 though. My understanding is that amplitude is related to the energy contained within the waves. I see your point when you say that amplitude is increased through using a larger teeth wheel...

Hi all, I was puzzled by the answers offered by an assessment book on this 2 questions. Hope fellow forummers can help me out on this please. 1. A thin steel card is made to vibrate by holding it against the teeth of a cog wheel. The wheel is rotated with increasing speed. The sound wave...

Thanks Stonebridge for the reply.I see the problem is more of being logically coherent...

Hi there, I saw this question in a book. Basically, we are asked to comment on the effects of Tension of a guitar chord and the Elasticity of the chord itself on the frequency of the sound the guitar produces. I understand Elasticity will have a positive effect on the speed of sound, and...