Recent content by muffintop

Homework Statement How do you find the potential energy of the hydrogen atom in n=11 state using Bohr model? express in eV Homework Equations I used U= -kZe^2/r The Attempt at a Solution =-8.99e9(1.6e-19)^2/5.29e^-11 =4.35e^-18J / 1.6e^-19 =-27.2eV

I got it thank you so much! I always get my "m" values wrong.

I got 29.4 micrometers. It's wrong though.

Homework Statement A single slit is illuminated with 630 nm light, and the resulting diffraction pattern is viewed on a screen 2.8 m away. If the linear distance between the first and second dark fringes of the pattern is 12 cm, what is the width of the slit? Homework Equations y=Ltan\theta W =...

Homework Statement Suppose the interference pattern shown in the figure is produced by monochromatic light passing through two slits, with a separation of 127 µm, and onto a screen 1.14 m away. What is the wavelength? Homework Equations wavelength = (dsin\theta) / m y=Ltan\theta...

Homework Statement NaCl is added slowly to a solution that is 0.010M in each Cu+, Ag+ and Au+. Ksp's are 1.9x10^-7, 1.8x10^-10 and 2.0x10^-13 respectively. Which compound will precipitate first? Can anyone tell me how the Ksp is different from Ka? and the relationship to precipitation?

Why is it that two power lines carrying anti parallel currents exert force away from each other as oppose to to each other?

I'm sorry but I don't get it. Can you show me, perhaps with a different example so it's not like you're doing the homework for me?

Homework Statement Find the area inside one leaf of the four-leaved rose r = cos2xHomework Equations A = 1/2 antiderivative abr2 dxThe Attempt at a Solution I just need help in finding the lower and upper limits of integration. But besides that, I know how to do the rest. If my integration is...

Yay 2x+4! Haha thanks.

Homework Statement Recently got a ti-89 and when I use it to derive for example d(x^2+4x-10, x) I get a decimal, 5.27 instead of getting 2x+4. The Attempt at a Solution I tried changing the mode to exact, approx, and auto. All give the same answer. I tried pressing the diamond button...

Horizontal. and since the I'm looking for the magnetic flux, it should be perpendicular to the area so I use sine instead of cosine. What a stupid mistake haha, thank you for your help!

1. At a certain location, the Earth's magnetic field has a magnitude of 5.6x10-5 T and points in a direction that is 72 degrees below the horizontal. FInd the magnitude of the magnetic flux through the top of a desk at this location that measures 110 cm by 57 cm. 2. I used the formula \Phi = BA...