Asound wave has a wavelength of 0.450 meters. if its speed in cold air is 330 meters/second, what is the wave's frequency?

Which describe reflection? check all that apply. light bounces off a boundary.

Animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. reactivate d) a dog is getting hot in the sunlight, so he moves to a shaded area.

What are the north and south poles of a solenoid change with?