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# physics practice tes

### practice test cumulative exam quarter 2

Question | Answer |
---|---|

Regarding the parameters of an ultrasound waves it is impossible 4 | Frequency equals one hurts |

Knowing the velocity and frequency of a wave would allow you to calculate | Wavelength and period |

Comparing a 1 megahertz wave with the two megahertz wave, which of the following is true? | Period of the 1 megahertz wave is double the period Of the two megahertz wave |

If an ultrasound wave travels from one medium with a density of 500 kg/m^3 to another medium with a density of 800 kg/m^3, which of the following would occur? | Propagation speed would increase |

Maximum variation of an acoustic variable is .07 centimeters. Minimum variation is .03 centimeters. Find the amplitude. | 0.02 centimeters |

What kind of energy is sound? | Mechanical |

Which of the following may be represented as the unit of density, pressure, temperature or particle motion? | Amplitude |

Which of the following could be expressed in units of megawatts per centimeter cubed? | Intensity |

What is the advantage of using low frequency ultrasound waves? | They penetrate deeper through tissue |

Sound is best described asA | Series of compressions and rarefactions in a medium |

Sound waves with frequencies between 20 Hertz and 20 kilohertz are | Audible sound |

As sound waves travel through the body their energy is mostly converted into | Heat |

If the frequency equals 1.8 megahertz find the wavelength | 0.86 millimeters |

The speed of sound depends on | Density and stiffness of the media |

If the frequency of a wave is 5 megahertz, what is the period? | 0.2 microseconds |

The frequency of an ultrasound wave with a. Of .08 microseconds is | 12.5 megahertz |

What is the frequency of a transducer that produces a wavelength of 0.5 millimeters? | 3.1 megahertz |

Propagation speed is doubled and frequency is constant, then the period is | Unchanged |

Propagation speed is defined as the | Distance a wave travels in one second |

Always traveling in medium one has a wavelength of 0.5 millimeters. It then travels into a new medium where its wavelength increases to 1 millimeter. What must be the speed in the new medium | Twice the speed of medium 1 |

The term rarefaction refers to the: | Low-energy phase valley of a wave cycle |

What is proportional to the square of the amplitude? | Power |

Listen example of two things directly related? | Crystal thickness and wavelength |

Just found beams with different frequencies are traveling through the same medium. The higher frequency wave has | A shorter period and a shorter wavelength |

If the frequency of ultrasound wave is three times the frequency of wave B then the period of wave a is blank the period of wave B | 1/3 |

Compare the wavelength of a 5 megahertz transducer to a 2.5 megahertz transducer. The wavelength of the higher frequency transducer is | Half as long |

T equals 0.3 microseconds. Find F | 3.3 megahertz |

Wavelength equals one millimeter. Find F. | 1.54 megahertz |

A transducer with a period of 0.5 microseconds has a wavelength of: | .77 Millimeters |

All of the following are acoustic variables that vary as a sound wave propagates through a medium except density, pressure, mass, temperature, particle motion | Mass |

Higher frequency waves have: | Better resolution |

If weve length equal 0.9 millimeters, find s | 1.7 megahertz |

Frequency equals 20 megahertz. Find the period in microseconds. | 0.42 millimeters |