After a beam of UV light with the wavelength of 300 nm in the vacuum travels from vacuum into a glass, its wavelength changes to 250 nm. What is the refractive index of this glass for this light beam? Please keep 2 significant figures.

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?

Which of these activities increases the amount of carbon in the atmosphere?