tempo

No' date=' electromagnetic radiation is not matter, since it has no mass.

 

If you're defining non-matter as "that which is not matter", then yes, it would make sense for a scientist to say that non-matter can interact with matter, since EM radiation definitely does interact with matter.[/quote']

 

i find the idea of non-matter really interesting... that something can exist without mass and without occupying space... makes me wonder about what it actually is... and all i can conclude is that it is a capacity to affect matter

 

anyway thanks for your input

I'm thinking in circles and would appreciate somebody's help.

Firstly, is electromagnetic radiation matter?

Secondly, would it make sense for a scientist to say that non-matter can interact with matter?

Cheers

ah ok, i understand now.. thank you so much for writing that up.

what would you do to improve the NHS?

In regards to the colors of the halogens, it probably does have something to do with the arrangement of the electrons as each of the halogens does have a color to it and that's a unique trait amongst that group. Since the noble gases right after the halogens are colorless, it would make one think that the one electron short of a full shell plays a part in how the halogens absorb/reflect light.

yeh that makes sense ^

would you also know why the halogens get darker as u go down the group?

as the shells further out are being filled, and the energy jump between the further shells is smaller, i would have thought that the halogens would go from violet to red as u go down the group, as the electrons would only need a small amount of energy (hence related to red as opposed to violet) to move to a higher energy level before releasing this energy again.

hey,

why do the colours of the halogens change from Fluorine to Iodine?

Actually I think it will be 50-50.

50.4451 ml of DCPIP and 49.6649 of water to be exact.

Is this correct? Please...

It's roughly 50ml of each, how accurate do you need it?

i'd like it accurate please, so that i can get good marks for my titration investigation

I have a DCPIP solution of 3.37*10^-3 M

I need it to be 1.7*10^-3 M

I want 100ml of it.

So how much water and how much of the 3.37*10^-3 M DCPIP do I have to put in.

Also, anybody know a website or formula so I know for next time...

Thanks a lot. By the way, 3.37/1.7=1.98235 and 1.7/3.37=0.504451

Programmed cell death is a sacrifice of the few to ensure the survival and reproduction of the many.

Which are the few cells programmed to die i.e. how are they chosen?

Thanks for the answers.

Good luck on the interview... I had a friend who just got into Cambridge. I hear they're really tough and force you to think in abstract ways. If you can do that, then you should be fine.

Why does programmed cell death occur? Why do all cells have a death wish?

Out of interest, what happens when cells die?

The first 2 qns are cambridge interview qns

Depends on the cell type and the cell its self. Search Goolge images with the name of the cell your looking for and yo'll probably get some good 3D drawing results!

thanks i did just that and it helped.

Thanks RyanJ...

A finite number divided by nothing (zero) is infinity.

A finite number divided by infinity is nothing (zero).

Therefore, nothing multiplied by infinite equals a finite number.

Proof is proof, or is it?

this is sort of a half-asked answer' date=' but it's better then nothing...

 

http://www.madsci.org/posts/archives/dec96/848098086.Cb.r.html[/quote']

 

thank you , its just what i need

During mitosis, the centrioles form the spindle fibres in a animal cell.

During mitosis, spindle fibres are still formed in a plant cell but there are no centrioles.

So how does this work then?

What is the 3D structure of a cell?

Is it a sphere? Is it a cuboid?

When we look at cells under a microscope, are the cells flattened?

Thanks a lot

You could prove it with some math but basically it's just because the speed of the water is increasing while it's falling and since the flowrate is the same for every hight the volume at that hight must decrease.

Ah I understand, thank you.

But why does the flow rate have to be the same at every height?

One more thing if it really would be ONE column of water released at one time and falling (not streaming water)

then all molecuse would fall at the same speed and you wouldn't have this effect.

I see what you mean. That if the water molecules were connected in a column, then an increase in speed would affect the whole column of the water. But wouldn't an increase in speed increase the flow rate and the so the width of the column would have to decrease again like before???

Why is a falling column of water thinner at the bottom?

I don't understand why this is...

Why are humans made of carbon? What else might they be made of?

This is a Cambridge University question.... that I have no idea about. Does anyone know?

What would you do if there was one patient with smallpox?

Of course the patient would have to be isolated but then what would happen to the patient...