Recent content by zhen

Just a simple question about the Op-amp. For inverting amplifer circuit, if I connect the positive terminal of the power supply to the Vcc, and the nevgative terminal to the Vee. What will happen to out put signal related to the in-put signal? Thanks.

oh, yes,...the approximation.. thank you very much.

the question is: a mircroscope is focused on a black dot. when a 1.00-cm-thick piece of plastic is placed over the dot, the microscope objective has to be raised 0.40 cm to bring the dot back into focus. what is the index of refraction of the plastic... I spent a lot of time on this...

Thank you, same as what i guess...

thanks again.:smile:

i am not quite understand how a lighting rod work, and its relationship between the electric field around it. will the long rod have a better performance then the shorter one's? or maybe a spherical rod...

thanks very much, but i wonder what kind formula will be apporiated for this kind question?

the question is: Two radio antennas are separatedf by 2.0m. Both broadcast indentical 750MHz waves. If you walk around the antennas in a circle of radius 10m, how many maxima will you detect? I am stucked in the question, and have very little idea to approch it... the distance between two...

thanks very much, i am really appriciated.

i check it, there is nothing wrong. so... i think there is something wrong in the question. I choose the closest answer which is 30 somthing, and that is correct...

I don't think I missed any equation,(maybe there are, but I really can not think of one), and there is no mistake in the calculation.

question: How much energy in kilojoules is required to convert 10.0 g of ice at -108 to water vapor at 1108°C? Specific heats are 2.09 J/g K for both ice and water vapor, and 4.18 J/g K for liquid water. Heats of vaporization and fusion are 2260 and 335 J/g. This is what I did...

In my textbook, it shows difference configuration. When I remove two electrons from the picture in the website, it sitll removed the 3d first, and left the 4s untouch. anyway, thanks for the help.

But the electron configuration of Ni is [Ar] 4s2, 3d8, shouldn't you remove the electron from the 3d8 first? Even though youn sounds right, I still have a little confusion.

thanks, I noticed I was drawing the wrong structure, which the H has connected to the Cl.