Recent content by baolkvn

u're welcom kcodon.

Hi Kcondo, An atom in basic energy state absorbs a photon only when there is resonance, i.e the frequency or photon equals to resonant frequency. That condition explains why an atom can not absorb photon with higher or lower energy, because, a photon with higher or lower energy has frequency...

We have (n-1)k = nk -k = (k-1)n + (n-k). "a" will be (k-1), and "b" will be (n-k). The number of finger in the left of the kth finger is (k-1), right? So it's "a". And similarly, the number of finger in the right is (n-k), so it's "b". "nk-k = (k-1)n + (n-k)" comes from the idea that change...

Well, differentiable and continuous is not equivalent. continuous if differentiable, but if continous, we can't conlude it is differentiable. 2 formulas below are definition of continuous and differentiable properties of a funtion, for example,F(x) : + F(x) is continuous at x0 <=>...