If the speed of a wave decreases but the wavelength remains the same, what must be true of its frequency? the frequency will decrease. the frequency will fluctuate wildly. the frequency will increase. the frequency will stay the same.

The frequency increases.

Here's an easy way to think about this. The wavelength is the distance from crest to crest, or trough to trough -- equivalently, it's the distance the wave travels in one period. This means that the speed of the wave is the wavelength divided by the period, or v=λTv=λT . But the frequency is just the reciprocal of the period, so v=λfv=λf. Clearly, if v increases and the frequency stays the same, the wavelength must increase by an equivalent factor.

The frequency will Increase

vascular tissue transports materials from the environment into the plant.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation: