Question

1) IF A MACHINE DOES AN AMOUNT OF WORK IN ONE-FIFTH OF THE USUAL TIME, WHAT...

1) IF A MACHINE DOES AN AMOUNT OF WORK IN ONE-FIFTH OF THE USUAL TIME, WHAT HAPPENS TO THE POWER INVOLVED?

2) WHAT IS THE PRIMARY DIFFERENCE BETWEEN ULTRASOUND USED FOR DIAGNOSTIC PURPOSES AND THAT USED FOR THERAPEUTIC PURPOSES?

3) A PIANO NOTE AND THE SAME NOTE PLAYED ON A VIOLIN SOUND DIFFERENTLY. WHAT IS THE REASON FOR THAT DIFFERENCE IN SOUND?

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Homework Answers

Answer #1

1) Since power is work divided by time, The power gets increased by 5 times.

3) Apart from frequency and Amplitude one more factor determines the sound ,The factor is called quality or timbre, Which depends on the source from which the sound is coming . So two sounds of same frequency and Amplitude may sound different as they come from different source.

2)  DIAGNOSTIC PURPOSES (Ultra sound)- Frequency = Low frequncy, Uses both sending and receiving sound signals which are processed into image based on the attenuation or absorption of tissues, No hazard as low freq.The professionals use a term ALARA as low as reasonable achieavable.

THERAPEUTIC PURPOSES- Higher frequency causes cavitaion or heating of tissues. No image is obtained. One problem is the misuse of ultra sound at this freq.The object of THERAPEUTIC ultrasound is to alter or break down. eg a heel spur

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