The separation of bright fringes formed by passing green light through a grading will move wave. further apart if the light is changed to blue light

Why do atoms emit energy of only specific wavelengths

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.

Why is a noble gas different from other elements?