How does knowing the time constant of an RL or RC circuit help us decide the width of a practical pulse input that is short enough to provide a good approximation of an impulse

The plum pudding model of the atom states that ?

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?