Recent content by strikingleafs01

nope, still nothing, anyone know anything??

hey Draco, do u go to UTSC?

1. Homework Statement A scientist needs to focus a helium-neon laser beam (lamda = 633nm) to a 10 micrometre diameter spot 8.0 cm behind the lens. a) What focal-length should she use? b) What minimum diameter should she use? 2. Homework Equations w = (2.44lambda * focal length) /...

I cannot seem to find any modification of this equation anywhere, but it seems that this is the only equation that is used to solve this problem

Homework Statement A scientist needs to focus a helium-neon laser beam (lamda = 633nm) to a 10 micrometre diameter spot 8.0 cm behind the lens. a) What focal-length should she use? b) What minimum diameter should she use? Homework Equations w = (2.44lambda * focal length) /...

i'm getting now double of that, and half of that value, anyone have any ideas still? this assignment is due 12:00pm tomorrow for us

So what I did for this question is, attempt to plug in values for 'm' so, for example 390 = m v/2L 390 = 1 343/2L and find length that way, it turned out that 390 represents the 3rd modal where (m = 3). Velocity is of course 343 m/s because sound will travel thorugh the tube which is...

Homework Statement A 75 g bungee cord has an equilibrium length of 1.20 m. The cord is stretched to a length of 1.80 m, then vibrated at 20 Hz. This produces a standing wave with two antinodes. Homework Equations I really am not sure how to approach this using an equation, tried to use...