1)Una cuerda de un arpa sinfónica de 3,2 m de longitud se somete a una tensión de 354,6 N, si su masa es de 78,4 g. Calcular: la densidad lineal de la cuerda y la velocidad de propagación de una onda en dicha cuerda.

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?