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Cool thanks

I just can't seem to figure out how to do this question. Can anyone please explain the answer (B=-5) A parabola whose equation is in the form of y=Bx^2 (where B is a constant) has the line 20x - y + 20= 0 as a tangent. Find the value of B. Thanks

So does increasing frequency make electrons emit faster? or more electrons are emitted at the same velocity?

Thanks for that very good reply =)

Firstly (this may be a stupid question) but is there a difference with intensity and frequency of light (say UV)? Also what is the relationship, if any between intensity, frequency, speed of electrons emitted and number of electrons emitted in the photoelectric effect?

Thanks I was thinking of integral

An object is stationary in space and located at a distance 10000km from the centre of a certain planet.It is found tha 1.0MJ of work needs to be done to move the object to a stationary point 20000km from centre of planet. Calculate how much more work need to be done to move the object to...

Ey Shuning, we do exact same subjects (except for chinese) haha

It's not the fact that Maths Ext 2 is hard (well it is if you are not mathematically "gifted"), there is just ALOT of stuff you have to remember and that is where most of your workload comes from. Doing that extra unit means in most cases you can drop another 2 units (because you will more than...

Does anyone think "Curious Case of Benjamin Button" would be a good related text? I thought it would suit belonging for obvious reasons, so what do you all think?

Ok then for arguments sake, 0.999c

Because the formula is divided by distance "r", the larger "r" gets the closer GPE approaches 0 until such a point at infinite meters GPE will be 0.

What do you see if you hold a mirror in front of you and run at the speed of light (not in any form of vehicle). I know nothing can run at the speed of light let alone fly, but what would you see in the mirror?

21 Economic Models explained with Cows SOCIALISM You have 2 cows. You give one to your neighbour. COMMUNISM You have 2 cows. The State takes both and gives you some milk. FASCISM You have 2 cows. The State takes both and sells you some milk. NAZISM You have 2...