Recent content by xinlan

oh my.. thank you so much to Phlogistonian.. :)

the real answer is 6.022, I already rounded up to 6..

I really appreciate that you help me.. but I'm totally confused..

so f = (mu*B*cos pi)/h ?

ehm.. why does this has to do with force and work? the angle between magnetic moment and B field would be zero because both of them are in the z direction.

Homework Statement If protons with magnetic moment mu in the z direction are in a strong magnetic field of magnitude B in the z direction, what is the frequency f of radiation that will be absorbed by the proton as it transitions from parallel to antiparallel states? Express your answer in...

Homework Statement When discussing attempts to make any type of fusion into a workable power source, an important concept is the "break-even" point. The break-even point is reached when the fusion process generates as much energy as was initially put in (i.e., the energy output equals the...

please somebody help me.. this is urgent..

I got it.. :)

I should convert all the units right? then if the lamda is negative, the half-life will be negative, and should I just plug in the minus sign as well on the computer?

Homework Statement Find the age t of a sample, if the total mass of carbon in the sample is m_c, the activity of the sample is A, the current ratio of carbon 14 to total carbon in the atmosphere is r , and the decay constant of carbon 14 is lamda . Assume that, at any time, carbon 14 is a...

Homework Statement Measurements of a certain isotope tell you that the decay rate decreases from 8337 decays/minute to 3174 decays/minute over a period of 5.00 days. Homework Equations R=Ro.e^-lamda/t then T1/2 = ln(2)/lamda The Attempt at a Solution I converted all the units...

I got it.. Thank you to Dick.. :)

Homework Statement An element of atomic number 82 and mass number 214 decays radioactively to an element of atomic number 82 and mass number 210. Which of the following emissions achieve this result? Check all that apply. a. four beta particles b. two beta particles and one alpha...

never mind.. I got it.. :)