Recent content by r_maths

\cos(\theta-\lambda) Thanks

Angle C is pi/2 - theta (radians) "pi over two minus theta" ie. 90 deegrees - theta. I did show my attempt at it, i couldn't get further.

http://img117.imageshack.us/img117/1482/graph015tt6.png I know an alternative way of showing Sin C is cos 'theta'. Thanks

Ok, thanks Mystic998 and everyone else who helped out.

Because of: http://img66.imageshack.us/img66/6338/graph012xj9.png ?[/URL]

http://img124.imageshack.us/img124/2865/graph011ux7.png I hope... I don't quite understand, how I'm I to know 0.29 instead of 1.71 was to be used?

http://img143.imageshack.us/img143/5615/graph009um6.png

Are you sure its "3.5k" ohms? Because that would be 3500ohms.

How is that going to lead me to the answer? :redface: If I substitute "p" back to "k". I don't see how I can get 0.44

Still cannot get answer. http://img142.imageshack.us/img142/7294/graph008qz9.png

I see now, so silly. Thanks

http://img267.imageshack.us/img267/7201/graph007pp4.png ? :S

http://img62.imageshack.us/img62/1393/graph005tm7.png http://img49.imageshack.us/img49/2026/graph006td1.png

Constructive interference, waves meet in phase. At P would the zero order maximum. At Q would be first order maximum. I tried the similar triangles but that didn't lead to finding the lengths... http://img19.imageshack.us/img19/4990/capturewiz007my4.jpg

Really stuck at this question. In an experiment on sound interference, two sources A and B are placed 2m apart. As a girl walks from X to Y she hears a point of maximum loudness ar point P and the next at point Q. Using information from the diagram below find distances AQ and BQ...