Thursday, February 26, 2009

A Curious Case of..

I an currently undergoing a training in the East Coast. Some of the keypoints I learnt today is about concept of ultrasonic, and how it differs in range.

Before a cat gets killed out of curiousity, I asked Uncle Google on the definition of ultrasonic:

The term "ultrasonic" applied to sound refers to anything above the frequencies of audible sound, and nominally includes anything over 20,000 Hz. Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults and thus, 20 kHz serves as a useful lower limit in describing ultrasound. The production of ultrasound is used in many different fields, typically to penetrate a medium and measure the reflection signature or supply focused energy.

Then I wonder, how is supersonic differs in range, compared to ultrasonic?

The term supersonic is used to define a speed that is over the speed of sound (Mach 1). At a typical temperature like 21 °C (70 °F), the threshold value required for an object to be traveling at a supersonic speed is approximately 344 m/s, (1,129 ft/s, 761 mph or 1,238 km/h).

Ooh ok, actually they're incomparable to each other, like comparing apple and orange. Ultrasonic refers to very high frequency, whereas supersonic refers to very high speed.

Thus I can't avoid but thinking,

superman lawan ultraman, sape yang akan menang nanti?

P/S : I'm high on caffein, thus the merapu thought

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