Physics Unit 1 test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| show | Variables
🗑
|
||||
| Sound is a traveling vaiation in quantites called _________ variables. | show 🗑
|
||||
| show | 20,000
🗑
|
||||
| show | pressure, density
🗑
|
||||
| show | B. Propagation Speed
🗑
|
||||
| Frequency is the number of ________ an acoustic variable goes through in a second. | show 🗑
|
||||
| show | hertz, Hz
🗑
|
||||
| Period is the ________ that it takes for one cycle to occur. | show 🗑
|
||||
| show | Frequency
🗑
|
||||
| Wavelength is the length of ________ which one cycle occurs. | show 🗑
|
||||
| Popagation speed is teh speed with which a(n) _______ moves through a medium. | show 🗑
|
||||
| Wavelength is equal to ________ _________ divided by _________. | show 🗑
|
||||
| show | Density, Stiffness
🗑
|
||||
| Propagation speed INCREASES if ________ is INCREASED. | show 🗑
|
||||
| show | 1540, 1.54
🗑
|
||||
| Propagation speed is determinded by the ________. | show 🗑
|
||||
| show | Gas - Liquid - Solid
🗑
|
||||
| The wavelength of 7 - MHz ultrasound in soft tissues is ________ mm. | show 🗑
|
||||
| show | INCREASES
🗑
|
||||
| It takes ________ microseconds for ultrasound to travel 1.54 cm in soft tissue. | show 🗑
|
||||
| Propagation speed in bone is ________ that in soft tissues. | show 🗑
|
||||
| Sound travels faster in ________. A. Air B. Helium C. Water D. Steel | show 🗑
|
||||
| show | Stiffness
🗑
|
||||
| Sound travels slowest in ________. | show 🗑
|
||||
| Sound is a ________ ________ wave. | show 🗑
|
||||
| show | Doubled
🗑
|
||||
| show | 1
🗑
|
||||
| show | Unchanged (determined by medium)
🗑
|
||||
| Waves can carry ________ from one place to another. | show 🗑
|
||||
| T or F - If two media have different stiffnesses, the one with the higher stiffness will have the higher propagation speed. | show 🗑
|
||||
| show | 6
🗑
|
||||
| The odd harmonics of 2 MHz are ________ MHz. | show 🗑
|
||||
| The even harmonic of 2 MHz are ________ MHz. | show 🗑
|
||||
| show | Propagation speed depends on pressure and the waveform changes shape as it travels
🗑
|
||||
| show | True
🗑
|
||||
| show | True
🗑
|
||||
| show | Density x Propagation Speed
🗑
|
||||
| show | Continous Wave
🗑
|
||||
| Pulse Repetition Frequence (PRF) is the number of ________ occuring in 1 second. | show 🗑
|
||||
| Pulse Repetition ________ is the time from the beginning of one pulse to the beginning of the next. | show 🗑
|
||||
| show | DECREASES
🗑
|
||||
| Pulse duration is the ________ it takes for a pulse to occur. | show 🗑
|
||||
| show | Length, Space
🗑
|
||||
| show | Duty factor
🗑
|
||||
| Pulse duation equals the number of cycles in the pulse multiplied by ________. | show 🗑
|
||||
| SPL equals the number of cycles in the pulse multiplied by ________. | show 🗑
|
||||
| The duty factor of continuous wave sound is ________. | show 🗑
|
||||
| show | 6
🗑
|
||||
| show | .4 (Period is .2 ms, soft tissue is irrelevant.)
🗑
|
||||
| For a 1-kHz PRF, the pulse repetition period is ________ ms. | show 🗑
|
||||
| How many cycles are there in 1 second of continuous wave 5-MHz ultrasound? | show 🗑
|
||||
| How many cycles are there in 1 second of pulsed 5-MHz ultrasound with a duty factor of .01(1%)? | show 🗑
|
||||
| For pulsed ultrasound, the duty factor is always ________ ________ one. | show 🗑
|
||||
| show | .1
🗑
|
||||
| Amplitude is the maximum ________ that occurs in an acoustic variable. | show 🗑
|
||||
| Intensity is the ________ in a wave divided by ________. | show 🗑
|
||||
| The unit for intensity is ________. | show 🗑
|
||||
| show | Amplitude
🗑
|
||||
| show | Doubled
🗑
|
||||
| show | Halved
🗑
|
||||
| If both power and area are doubled, intensity is ________. | show 🗑
|
||||
| If amplitude is doubled, intensity is ________. | show 🗑
|
||||
| show | Amplitude, Intensity
🗑
|
||||
| Attenuation consists of ________, ________, and ________. | show 🗑
|
||||
| show | CM (Centimeter)
🗑
|
||||
| show | dB, dB/cm
🗑
|
||||
| For soft tissues, there is approx. ________ dB of attenuation per cm for each MHz of frequency. | show 🗑
|
||||
| show | 1.5 dB/cm
🗑
|
||||
| show | INCREASES
🗑
|
||||
| show | Doubled
🗑
|
||||
| If path length is doubled attenuatio is ________. | show 🗑
|
||||
| If both frequency and path length are doubled, attenuation is ________. | show 🗑
|
||||
| show | Unchanged
🗑
|
||||
| Absorption is the conversion of ________ to ________. | show 🗑
|
||||
| show | No
🗑
|
||||
| Is attenuation in bone higher or lower than in soft tissue? | show 🗑
|
||||
| The imaging depth (penetration) ________ as frequency INCREASES. | show 🗑
|
||||
| When ultrasound encounters a boundary with perpendicular incidence, the ________ of the tissues must be different to produce a reflection (echo). | show 🗑
|
||||
| With perp incidence, two media ________ and the incident ________ must be known to calculate the reflected intensity. | show 🗑
|
||||
| With perep incidence, two media ________ must be known to calculate the intensity reflection coefficient. | show 🗑
|
||||
| show | True For perp incidence
🗑
|
||||
| With perep incidence, the reflected intensity depends on the ________. | show 🗑
|
||||
| Refraction is a change in ________ of sound when it crosses a boundray. | show 🗑
|
||||
| Refraction is caused by a change in ________ ________ at the boundary. | show 🗑
|
||||
| Under what tow conditions does refraction NOT occur? | show 🗑
|
||||
| show | Scattering
🗑
|
||||
| show | True
🗑
|
||||
| show | Travel time and Speed
🗑
|
||||
| No reflection wil occur with perpendicular incidence if the media ________ are equal. | show 🗑
|
||||
| show | False
🗑
|
||||
| show | Transmission
🗑
|
||||
| Portion of sound returned from a media boundary (Echos) is ________. | show 🗑
|
||||
| Rate at which energy passes through a unit area is ________. | show 🗑
|
||||
| show | INCREASES
🗑
|
||||
| If frequency INCREASES, attenuation coefficient ________. | show 🗑
|
||||
| If frequency INCREASES, attenuation ________. | show 🗑
|
||||
| show | Pulse
🗑
|
||||
| show | Pa (Pascals)
🗑
|
||||
| show | Pulse duration
🗑
|
||||
| Start of one pulse to the start of the next is ________. This INCLUDES LISTENING TIME!!! | show 🗑
|
||||
| The formula for PRP = ________. | show 🗑
|
||||
| show | On, Off
🗑
|
||||
| show | DECREASES
🗑
|
||||
| Avg. Duty Factor is ________ %. | show 🗑
|
||||
| show | DECREASES
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
qtpants7
Popular Physics sets