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Ultrasound is a cyclic sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.
Who among the following developed the technology of under-ground nuclear explosion?
Inactive Nitrogen and Argon gases are usually used in electric bulbs in order to
The storage battery of a car has an emf of 15 V. If the internal resistance of the battery is 0.5 Ω, what is the maximum current that can be drawn from...
The order of wavelengths for ordinary light is:
How does the angle of minimum deviation of a glass prism of refractive index 1.5 change, if it is immersed in a liquid of refractive index 1.25?
Which of the following is the energy quantum of radiation?
The filament of a bulb is made up of?
The ozone hole that has been detected lies in the atmosphere above –
Which law explains why it is difficult to hammer a nail into a freely suspended wooden frame?
A sudden drop in barometric pressure indicates which of the following?
