What type of electromagnetic wave is sent as a signal by cell phone to the nearest cell tower? O A. Gamma rays
O B. Microwaves
O C. Ultraviolet
O D. X-rays

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?

Most short-period comets do not have randomly oriented orbits because

Explain why you think this diagram shows what happened to the carbon in the biodome.