Chapter 1: Q7CQ (page 32)
Classical physics is a good approximation to modern physics under certain circumstances. What are they?
Classical physics will be a good approximation for quantum physics, only for those systems that are composed of large number of particles.
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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.
The speed of sound is measured to be\({\rm{342 }}{{\rm{m}} \mathord{\left/ {\vphantom {{\rm{m}} {\rm{s}}}} \right. \\} {\rm{s}}}\)on a certain day. What is this in km/h?
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 (\({\bf{3 \times 1}}{{\bf{0}}^{\bf{8}}}\;{\bf{m/s}}\)).
Mount Everest, at\({\bf{29}},{\bf{028}}\)feet, is the tallest mountain on the Earth. What is its height in kilometres? (Assume that\({\bf{1}}{\rm{ }}{\bf{kilometre}}\)equals \({\bf{3}},{\bf{281}}{\rm{ }}{\bf{feet}}\).)
A can contains 375 mL of soda. How much is left after 308 mL is removed?
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