#### Assuming one nerve impulse must end before another can begin, what is the maximum firing rate of a nerve in impulses per second?

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# Tag: Approximation

#### Assuming one nerve impulse must end before another can begin, what is the maximum firing rate of a nerve in impulses per second?

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#### (a) Calculate the number of cells in a hummingbird assuming the mass of an average cell is ten times the mass of a bacterium.

#### (b) Making the same assumption, how many cells are there in a human?

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#### (a) What fraction of Earth’s diameter is the greatest ocean depth?

#### (b) The greatest mountain height?

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#### Approximately how many atoms thick is a cell membrane, assuming all atoms there average about twice the size of a hydrogen atom?

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#### Calculate the approximate number of atoms in a bacterium. Assume that the average mass of an atom in the bacterium is ten times the mass of a hydrogen atom. (Hint: The mass of a hydrogen atom is on the order of 10^{-27} kg; and the mass of a bacterium is on the order of 10^{-15} kg)

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#### How many times longer than the mean life of an extremely unstable atomic nucleus is the lifetime of a human? (Hint: The lifetime of an unstable atomic nucleus is on the order of 10^{-22} s .)

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### A generation is about one-third of a lifetime. Approximately how many generations have passed since the year 0 AD?

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