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Chapter 1: Q4PE (page 11)
If a galaxy is\({\rm{500 Mly}}\)away from us, how fast do we expect it to be moving and in what direction?
The direction is obtained as: \({\rm{1}}{{\rm{0}}^{\rm{4}}}\,{\rm{km/s}}\) away from us.
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What is the sound intensity level in decibels of ultrasound of intensity \[{10^5}{\rm{ W}} \cdot {{\rm{m}}^{ - 2}}\], used to pulverize tissue during surgery?
A real process may be nearly adiabatic if it occurs over a very short time. How does the short time span help the process to be adiabatic?
What is the ratio of intensities of two sounds of identical frequency if the first is just barely discernible as louder to a person than the second?
An infant’s pulse rate is measured to be. What is the percent uncertainty in this measurement?
Find the sound intensity level in decibels of \[{\rm{2 \times 1}}{{\rm{0}}^{{\rm{ - 2}}}}{\rm{ W}} \cdot {{\rm{m}}^{{\rm{ - 2}}}}\]ultrasound used in medical diagnostics.
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