What two units are used to measure the frequency and amplitude of a sound wave?

A. Hertz is a measure of frequency, and a decibel is a measure of amplitude.

B. A decibel is a measure of frequency, and hertz is a measure of amplitude.

C. The quantization is a measure of frequency, and sampling is a measure of amplitude.

D. Sampling is a measure of frequency, and the quantization is a measure of amplitude.

5.a fishing rod is formed from a composite material of 0.5 kg of glass fibers embedded in a matrix of 0.5 kg of epoxy resin. the glass fibers are assumed to be long, continuous and unidirectional. to achieve a greater stiffness it is proposed to use a different composite that is comprised of long continuous carbon fibers that will be embedded in a matrix of 0.5 kg of epoxy resin. if the modulus of elasticity of the carbon fiber composite is 10% greater than the elastic modulus of the glass fiber composite, estimate the mass of carbon fibers that will be used to make the carbon fiber composite. assume the applied tensile stress is parallel to the direction of the long axis of the fibers. the epoxy resin, glass fiber, and carbon fiber have an elastic modulus of 5, 86, and 350 gpa respectively and a density of 1100, 2500, and 1800 respectively.