energy quantization

Derive the infinite square well energy quantization law, directly from the DeBroglie relation p=h/l, by fitting an integral number of half DeBroglie wavelengths l/2 into the width a of the well

Polarization of Light Waves

Unpolarized light passes through two polaroid sheets. The axis of the first is vertical, and that of the second is at 26.0° to the vertical. What fraction of the initial light is transmitted?

Interference in thin films

A transparent oil of index of refraction 1.29 spills on the surface of water (index of refraction 1.33), producing a maximum of reflection with normally incident violet light (wavelength 400 nm in air). Assuming the maximum occurs in the first order, determine the thickness of the oil slick.

Young's Double-Slit Interference

A riverside warehouse has two open doors, as in Figure P24.11. A boat on the river sounds its horn. To person A the sound is loud and clear. To person B the sound is barely audible. The principal wavelength of the sound waves is 2.80 m. Assuming person B is at the position of the first minimum, determine the distance between the doors, center to center. Please see attached for diagram.

what causes a spark from flint

Is it heat that causes flint (or the colliding element) to spark, or does a piece of that mineral burn up?