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Chapter 1: 36 PE (page 11)
Assuming one nerve impulse must end before another can begin, what is the maximum firing rate of a nerve in impulses per second?
Maximum firing rate of nerve impulse per second 1031/sec
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(a) Suppose that a person has an average heart rate of beats/ min. How many beats does he or she have in 2.0 y ? (b) In 2.00 y ? (c) In 2.000 y ?
Conversations with astronauts on the lunar surface were characterized by a kind of echo in which the earthbound person’s voice was so loud in the astronaut’s space helmet that it was picked up by the astronaut’s microphone and transmitted back to Earth. It is reasonable to assume that the echo time equals the time necessary for the radio wave to travel from the Earth to the Moon and back (that is, neglecting any time delays in the electronic equipment). Calculate the distance from Earth to the Moon given that the echo time was 2.56 s and that radio waves travel at the speed of light (\({\bf{3 \times 1}}{{\bf{0}}^{\bf{8}}}\;{\bf{m/s}}\)).
Find the components of \({v_{tot}}\) along a set of perpendicular axes rotated \(30^\circ \) counterclockwise relative to those in Figure 3.55.
Figure: The two velocities\({{\rm{v}}_{\rm{A}}}\)and\({{\rm{v}}_{\rm{B}}}\)add to give a total \({{\rm{v}}_{{\rm{tot}}}}\)
Identify some advantages of metric units.
The wavelength of the four Balmer series lines for hydrogen are found to be 410.3, 434.2, 486.3, and 656.5 nm. What average percentage difference is found between these wavelength numbers and those predicted by\[\frac{{\bf{1}}}{{\bf{\lambda }}}{\bf{ = R}}\left( {\frac{{\bf{1}}}{{{\bf{n}}_{\bf{f}}^{\bf{2}}}}{\bf{ - }}\frac{{\bf{1}}}{{{\bf{n}}_{\bf{i}}^{\bf{2}}}}} \right){\bf{?}}\]It is amazing how well a simple formula (disconnected originally from theory) could duplicate this phenomenon.
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