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Chapter 1: Q8CQ (page 32)
When is it necessary to use relativistic quantum mechanics?
In Physics, relativistic quantum mechanics is used for explaining the motion of those systems that have a size which is comparable to that of a hydrogen nucleus and are travelling at speeds comparable to the speed of light.
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(a) Find the size of the smallest detail observable in human tissue with 20MHz ultrasound. (b) Is its effective penetration depth great enough to examine the entire eye (about 3.00cm is needed)? (c) What is the wavelength of such ultrasound in air \[{0^o}{\rm{C }}\]?
Conversations with astronauts on the lunar surface were characterized by a kind of echo in which the earthbound person鈥檚 voice was so loud in the astronaut鈥檚 space helmet that it was picked up by the astronaut鈥檚 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 (\({\bf{3 \times 1}}{{\bf{0}}^{\bf{8}}}\;{\bf{m/s}}\)).
The time delay between transmission and the arrival of the reflected
wave of a signal using ultrasound traveling through a piece of fat tissue was 0.13ms. At what depth did this reflection occur?
(a)-What is the efficiency of a cyclical heat engine in which 75.0 kJ of heat transfer occurs to the environment for every 95.0 kJ of Heat transfer into the engine (b) How much work does it produce for 100.0 kJ of heat transfer into the engine?
Soccer fields vary in size. A large soccer field is 115 mlong and 85 mwide. What are its dimensions in feet and inches? (Assume that 1 meter equals 3.281 feets).
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