Recent content by Bassel AbdulSabour

If the spectral line of Hydrogen contains four colors, I don’t understand how the electron can jump four times to four different energy levels in the same moment?

Is the simple pendulum considered to be an example of oscillatory motion or periodic motion or both?

What's the difference between magnitude and size? I mean, how can I say that AB vector has a magnitude of 9 Newton, and its length is 4 cm.

Why do radio waves pass through walls while visible light can't? I guess this has something to do wit the wavelength. What I know is that higher wavelength means higher ability of penetration. So why radio waves penetrate obstacles?

Why are the resultant's X and Y components of two forces equal the sum of the X and Y components of the two forces?

What's the difference between saying that a vector's direction is north of east and north east?

I just want to know the difference between those rules: 1. R^2 = F1^2 * F2^2 + 2*F1*F2*COS(the angle between F1 and F2) 2. The second is about the parallelogram rule, it says that the two vectors are added and their summation is the magnitude of the resultant. Which one is correct?

i know it's an absurd question, but why are longitudinal waves called waves although they aren't wave-like?