For some purposes a photon—a quantum of electromagnetic radiation can be treated as a classical electromagnetic wave train with energy au = ħw, where ħ is planck's reduced constant and w is the angular frequency of the wave. photons are circularly polarized. a. in einstein's mechanics the mass m of a particle of energy eand momentum p is given by the relation e? - p²c2 = m4, where c is the speed of light in vacuum. calculate the mass of the photon, defined in this way. b. the spin quantum number s of a particle is its spin angular momentum s divided by planck's reduced constant ħ. calculate the spin quantum number of the photon, thus defined

The chart shows the costs and shipping times for materials that a company needs to build a new product. which describes the best trade-off if the company needs to start building their product within the next two years? they should order the domestic materials because it is always best to choose the fastest shipping time. they should order the imported materials because it is always best to choose the lowest cost for materials. since the shipping time is longer, they should order the domestic materials because the additional cost is worth it to get the materials in time. even though the shipping time is longer, they should order the imported materials because they are less expensive and should arrive in plenty of time to build the product.

Amaterial that provides resistance to the flow of electric current is called a(an) (1 points)

Is the portion of the electromagnetic spectrum that has a frequency just above that of visible light.