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DMSO Physics > Chapter 9 Q & A > Flashcards

Chapter 9 Q & A Flashcards

1
Q

what is the best extimate of the diameter or width of the sound beam as it exits the transducer

A 6 mm

B 9 mm

C 12 mm

D 8 mm

A

C

beam diameter at beginning is same as active element

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2
Q

what is the diameter of the sound beam at a depth of 8 cm

A 6 mm

B 9 mm

C 12 mm

D 8 mm

A

A

at end of near zone, beam diameter is one half width of the transducer diameter

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3
Q

what is the diameter of the sound beam at a depth of 16 cm

A 6 mm

B 9 mm

C 12 mm

D 8 mm

A

C

depth equal to 2 near zone lengths the beam diamter is same as the diameter of the active element

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4
Q

at what depth is the focus

A 6 cm

B 8 cm

C 1 cm

D 12 mm

A

B

focal depth is the same as the length of the near zone

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5
Q

what depth marks the beginning of the focal zone

A 6 cm

B 8 cm

C 12 mm

D 8 mm

A

A

focal zone is the region around the focus./ in this example the focal zone begins at a depth of 2 cm shallower than the focus

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6
Q

what depth marks the end of the focal zone

A 6 cm

B 8 cm

C 10 mm

D 10 cm

E 8 mm

A

D

the focal zone is the region around the focus. In this example the focal zone ends at a depth 2 cm deeper than the focus

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7
Q

at which of the following depths is the beam narrowing

A 6 cm

B 8 cm

C 12 cm

D 10 cm

E 12 cm

A

A

the beam narrows within the near zone

the only dpeth within the near zone is choice A

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8
Q

at whioch of the following is the beam widening

A 2 cm

B 4 cm

C 6 cm

D 8 cm

E 9.375 cm

A

E

the beam widens in the far zone.

the only depth within the far zone is choice E

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9
Q

at which of trhe following depths is the beam most likely to have the same diameter as it has at a depth of 11 cm

A 1 cm

B 3 cm

C 5 cm

D 8 cm

E 14 cm

A

C

think of the beam as being symmetrical around the focus. Thus the beam diameter will be similar when it is 3 cm shallower and 3 cm deeper than the focus

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10
Q

which of the following terms does not belong

A focus

B end of the near zone

C end of the fraunhofer zone

D middle of the focal zone

A

C

the end of the Fraunhofer zone is the end of the sound beam

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11
Q

a pair of 6 MHZ probes are identical except for the active element diameter. The active element diameters are 6 mm and 10 mm respectively. The sound beam of which probe will have a shallower focus

A

6 mm

smaller diameter crystals prodcue shallower foci

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12
Q

a pair of 9 mm diamter probes are identical except for freq. which is 3 MHz and 6 MHz respectively. which will have a shallower focus?

A

3 MHz has a shallower focus,

focal depth increases with freq

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13
Q

which of the following probes creates a beam with the depest focus

A 4 mm dia, 4 MHz

B 6 mm dia, 8 MHz

C 6 mm dia, 2 MHz

D 5 mm dia, 8 MHz

A

B

longer focal lengths are associated with larger diameter and higher freq

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14
Q

which of the following probes creates a beam with the shallowest focus

A 4 mm dia, 4 MHz

B 6 mm dia, 8 MHz

C 4 mm dia, 2 MHz

D 5 mm dia, 8 MHz

A

C

shorter focal lengths are associated with smaller diameter and lower freq

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15
Q

which of the folloing probres creates a beam with teh shallowest focus

A small dia, high freq

B large dia, high freq

C small dia, low freq

large dia, low freq

A

C

shorter focal lengths are associated with small diameter and low freq

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16
Q

active element diameter and near zone length are directly related

true/false

A

true

17
Q

transducer freq and near zone length are inversely related

true/false

A

false

18
Q

wavelength and near zone length are inversely related

true/false

A

true

19
Q

a pair of 6 MHz probes are identical except for the active element diameters, which are 6 mm and 10 mm respectively. Which beam will be more compact in the far filed?

A

10 mm probe has less divergence

20
Q

a pari of 9 mm diamter probes are identical except for freq, which are 3 MHz and 6 MHZ

which sound beam will spread out more in the far field

A

the 3 MHZ beam is more divergent

21
Q

which of the following probes creates a beam with the least divergence

A 4 mm dia, 4 MHz

B 6 mm dia, 8 MHz

C 6 mm dia, 2 MHz

D 5 mm dia, 8 MHz

A

b

divergence is minimized with large diameter high freq probes

22
Q

which of the followoing probes creates a beam with the most divergence

A 4 mm dia, 4 MHz

B 6 mm dia, 8 MHz

C 6 mm dia, 2 MHz

D 5 mm dia, 8 MHz

A

C

divergence is pronounced with small diameter low freq probes

23
Q

which of the folloing probes creates a beam with the most divergence

A small dia, high freq

B large dia, high freq

C small dia, low freq

D large dia, low freq

A

C

divergence is pronounced with small dia and low freq probes

24
Q

transducer freq and beam divergence are inversely related

true/false

A

true

higher freq creates less divergent beams

25
Q

active element dia and beam divergence are inversely related

true/false

A

True

crystals with larger dia create less divergence

26
Q

the freq of a transducer does not change. If the diameter of the new piezoelectric crystal increases what happens to the near zone length

A

increases

27
Q

freq of a transducer does not change. if the dia of the new piezoelectric crystal increases what happens to the beam diameter in the far zone

A

decreases

28
Q

freq of a transducer does not change. if the dia of the new piezoelectric crystal increases what happens to the wavelength

A

no change

29
Q

freq of a transducer does not change. if the dia of the new piezoelectric crystal increases what happens to the beam diameter in the near zone

A

increases

30
Q

at what location is the sound beam diamter three times greater than the transducer diameter

A at the end of the near zone

B at a depth equal to four focal lenghts

C at the end of the far zone

D at the triple diameter depth

A

B

the only region where the beam diameter exceeds the transducer diameter is at depths exceeding two focal lengths

31
Q

what is the shape of a sound beam created by a tiny piece of PZT

A hour glass

B V-shaped

C round

D shaped like a tube

A

B

small PZT creates a V-shaped beam

diffreaction pattern

Huygens wavelet

32
Q

which of the following explains why a sound beam created by a disc shaped crystal is hourglass shaped?

A Bernoullis Principle

B SHeffilds Law

C Ohms law

D Huygens Principle

A

D

Huygens Principle

33
Q

which of the following locatoins is the deepest

A end of the fresnal zone

C end of the focal zone

C end of the Fraunhofer zone

D end of the near zone

A

C

end of the Fraunhofer zone

34
Q

which of teh folloing locations is the most shallow

A beginning of the far zone

B beginning of the focal zone

C focal depth

D beginning of the Fraunhaofer zone

A

B

of these choices the beginning of the focal zone is the most shallow

DMSO Physics (16 decks)

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