1971Every Day ScienceMedium
When sound waves travel from air to water which of the following quantities remains unchanged?
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Correct answer
D. Frequency
Explanation
Sound is propagated in the form of longitudinal waves. When sound travels from one medium to another medium the wavelength and velocity remains changed and the frequency remains unchanged.The velocity of sound in the given medium is obtained by v=nW, where “n” is the frequency of sound and “W” is its wavelength in that medium. Velocity of sound is directly proportional to the wavelength.Thus, if the velocity of sound wave doubles when travelled from one medium to another medium then its wavelength also doubles.The frequency of sound depends on the source of the sound, not the medium of propagation .Hence the frequency does not change when travelled from air to water.
Correct answer
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Explanation
Elongation of eyeballs is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
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Explanation
Nicolas Copernicus is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
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Explanation
Pyridoxine is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
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Explanation
Infrasonic is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
B. capacitance
Explanation
Farad, unit of electrical capacitance (ability to hold an electric charge), in the metre–kilogram–second system of physical units, named in honour of the English scientist Michael Faraday. The capacitance of a capacitor is one farad when one coulomb of electricity changes the potential between the plates by one volt.
Correct answer
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Explanation
Carbon is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
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Explanation
Lactometer is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
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Explanation
Difference in crystalline Structure is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
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Explanation
vitamin E is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.