some of the most powerful lasers are based on the energy levels of neodymium in solids, such as glass. what wavelength of light is emitted when electrons transition from an energy level of 1.67 ev to 0.50 ev?

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards