Which of the following best describes reverberation? Question options:

A change in the sound wave velocity causes the wave to bend in a different direction.

The wave fronts become mixed and broken up due to contact with a rough or irregular surface.

A single sound undergoes several reflections due to multiple reflecting surfaces.

A fraction of the sound waves are absorbed by an object and converted to heat energy.

How do we measure or think of speed in the united states?

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?