¿A qué rapidez deberá acercarse una fuente sonora, cuya frecuencia de emisión en reposo es de 420 Hz, para que un

receptor escuche una frecuencia de 500 Hz?

An observer that stands still as the electron moves by him, will observe

Blank liquids and gases exert a buoyant force on objects placed in them

Aparticle of mass m is placed in a one-dimensional box of length l. the box is so small that the particle’s motion is relativistic, so that e p2/2m is not valid. (a) derive an expression for the energy levels of the particle using the relativistic energy–momentum relation and the quantization of momentum that derives from connement. (b) if the particle is an electron in a box of length l 1.00 1012 m, nd its lowest possible kinetic energy. by what percent is the nonrelativistic formula for the energy in error?