If the wavelength of a wave increases does its frequency also increase?

Which changes of state do the labels represent? a: b: c:

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?

Are formed where bumps from two surfaces come into contact ?