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physics

Why are optical fibers often called light pipes?

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physics

A sound wave of the note " $A$ " has a frequency of $440$ $\mathrm{Hz}$ in air. Which of these is closest to the wavelength of this sound? (The speed of sound in air is $343 \mathrm{~m} / \mathrm{s}$ .)
A. the length of a bug
B. the height of a desk
C. the length of a car
D. the width of a highway

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biology

Certain C—H groups can form weak hydrogen bonds. Why would such a group be more likely to be a hydrogen bond donor group when the C is next to N?

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physics

A nerve signal is transmitted through a neuron when an excess of $\textrm{Na+}$ ions suddenly enters the axon, a long cylindrical part of the neuron. Axons are approximately $10.0 \mu \mathrm{m}$ in diameter, and measurements show that about $5.6 \times 10^{11} \mathrm{Na}^{+}$ ions per meter (each of charge $+e$ ) enter during this process. Although the axon is a long cylinder, the charge does not all enter everywhere at the same time. A plausible model would be a series of point charges moving along the axon. Consider a $0.10-\textrm{mm}$ length of the axon and model it as a point charge. If the charge that enters each meter of the axon gets distributed uniformly along it, how many coulombs of charge enters a $0.10-\textrm{mm}$ length of the axon?