Which electron transition in an excited atom results in a release of energy? first shell to the third shell second shell to the fourth shell third shell to the fourth shell fourth shell to the second shell?

Aregular polygon has angkes of size 150° each.how many side has the polygon

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc

The inner planets or call terrestrial because they