PHY7

what does ultrasound require for motion imaging?

• 
  The speeds of the sound and of the moving object

• The speed of the sound, and the frequencies of the sound waves emitted and observed

• The speeds of the sound and of the moving object, and the frequencies of the sound waves emitted and observed

• The speeds of the sound and of the moving object, and the frequencies and wavelengths of the sound waves emitted and observed

how does ultrasound work?

• it uses the travel time of reflected sound waves through the body to calculate distance

• distance can be calculated as long as the speed of the traveling object is given

• distance can be calculated because the speed of the wave and how long the wave traveled is given

• the frequency and wavelengths determine the calculated distance determined

how to determine the harmonic of a standing wave in a closed pipe?

• count the number of 1/4 wavelengths

• count the number of total wavelengths

• count the number of 1/2 wavelengths

• count the number of wavelengths x4

how to determine the wavelength of a of pipe closed at both ends

• 4L/n when n = 1,2,3...

• 2L/n when n = 1,2,3...

• 4L/n when n = 1,3,5...

• 2L/n when n = 1,3,5...

how to determine the wavelength of a of pipe open at both ends

• 4L/n when n = 1,2,3...

• 2L/n when n = 1,2,3...

• 4L/n when n = 1,3,5...

• 2L/n when n = 1,3,5...

how to determine the wavelength of a of pipe open at one end

• 4L/n when n = 1,2,3...

• 2L/n when n = 1,2,3...

• 4L/n when n = 1,3,5...

• 2L/n when n = 1,3,5...

in closed pipes what harmonics are standing waves limited to?

• odd harmonics because the standing wave in a closed pipe has to have a node at one end and an antinode at the other end.

• odd harmonics because the standing wave in a closed pipe has to have a node at both ends.

• even harmonics because the standing wave in a closed pipe has to have a node at one end and an antinode at the other end.

• even harmonics because the standing wave in a closed pipe has to have an antinode at both ends.

how to determine the harmonic of an open pipe

• number of nodes

• number of half wavelengths

• L = wavelength/2

• L = wavelength/4

what is the difference between an open pipe and a closed pipe?

• a closed pipe is only closed at one end and supports an antinode and node. an open pipe supports antinodes at both ends

• a closed pipe is closed at both ends and supports two nodes. an open pipe supports antinodes at both ends

• an open pipe is only open at one end and supports an antinode and node. a closed pipe supports a node at both ends

• an open pipe is open at both ends and supports nodes at both ends. a closed pipe is only closed at one end and supports antinodes at both ends

how to visually determine the harmonic of a string attached at both ends

• the number of nodes and full wavelengths

• the number of antinodes and full wavelengths

• the number of half wavelengths

• the number of antinodes