Recent content by XTEND

okay. Do I need to use 4 sig figs for all the values? I'm getting 17514.8 now. It's too low.

is it my sig figs?

Homework Statement Calculate energy of a 0.07078nm photon Homework Equations E = hc / lamda The Attempt at a Solution (6.63x10E-34)(3.0x10E8) / (7.078x10E-11)(1.60x10E-19) =17563.2 eV But the correct answer is 17520

1.9878E-25/4.2E-7 = 4.7328E-19 (10x10E-3) / (4.7328E-19) = 2.1E16 Thank You!

okay. (6.626x10E-34)(3.0x10E8)=1.9878E-25 / 420nm = 4.7328E-28 (10x10E-3) / (4.7328E-28) = 2.1129E25 This is still not 2.1E16

Homework Statement An LED emits a light beam with a power of 10 mW. The wavelength of the light is 420 nm. How many 420nm photons are emitted per sec.? Homework Equations E=hc/lamda is 2.95E-9 P/E= Photons emitted per sec. (10*10E-3)(2.95E-9)=2.952E-11 The Attempt at a...

Ttt :-)

So, we'll say the kids were shrunk by a factor of 200. What about vision affects? For example, at a distance of 1.0 m from a child, how far apart would 2 point sources of light have to be, to be resolvable (this is the sharpness of the kids vision)? Wouldn't the resolution be too low for the...

I thought I set up the ICE method correctly? Is it not [Hg(CN)4]2? Yes same as K instab

Homework Statement Calculate the concentration of Hg+2 at equilibrium in a solution that is initially 0.10M in Hg+2 and 0.50M in CN-. K instab for [Hg(CN)4]2- = 3.0 x 10 -42 Homework Equations K instab The Attempt at a Solution [Hg(CN)4]2- --> Hg2+ + 4 CN- Initial Conc...

ya it must be SO3 But what about the name of the compound? I must be way off?

what about the first part for KE?

Homework Statement A coord. compound of mercury (II) is found to contain the sulfate ion and the potassium ion as well as Hg+2. Ba(NO3)2 solution is added to a water solution of this compound, but there is no precipitate. If the coord. # is 4, and a H20 solution of the compound shows an...

Can anyone help me with this? I think the velocity is 87548 m/s. Is this correct?

Homework Statement 2 large metal sheets are separated by a potential of 40 volts by a vaccum. When the proton particle (mass 1.67x10e-27 kg)is released close to the (+) sheet it moves closer to the (-) sheet by way of electric field. What's the KE right before the proton smacks the other...