[amp_mcq option1=”Speed of light” option2=”Intensity of heat” option3=”Intensity of sound” option4=”Radio wave frequency” correct=”option3″]<\/p>\n
The correct answer is: C. Intensity of sound.<\/p>\n
A decibel (dB) is a logarithmic unit that expresses the ratio of a physical quantity (such as sound pressure, power, or voltage) to a reference value. The reference value is often 1 milliwatt (mW) for power, 20 micropascals (\u00ce\u00bcPa) for sound pressure, and 1 volt (V) for voltage.<\/p>\n
Decibels are used to express a wide range of quantities, from the intensity of sound to the power of radio waves. They are also used to express the gain or loss of a signal in a communication system.<\/p>\n
The decibel is a convenient unit because it is a dimensionless quantity. This means that it can be used to express the ratio of any two quantities, regardless of their units.<\/p>\n
The decibel is also a relative unit. This means that it expresses the ratio of a quantity to a reference value, rather than the absolute value of the quantity itself. This makes it useful for comparing quantities that have different units or that are measured on different scales.<\/p>\n
The decibel is a powerful unit that can be used to express a wide range of quantities. It is a convenient and relative unit that is used in a variety of fields.<\/p>\n
Option A is incorrect because the speed of light is measured in meters per second (m\/s).<\/p>\n
Option B is incorrect because the intensity of heat is measured in watts per square meter (W\/m2).<\/p>\n
Option D is incorrect because the frequency of radio waves is measured in hertz (Hz).<\/p>\n","protected":false},"excerpt":{"rendered":"
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