Which of following sentence is true about sound wave?
A)  speed of sound is higher in iron than nitrogen.
B)  speed of sound is constant, doesn’t depend on medium.
C)  temperature and pressure condition doesn’t affect the speed of sound.
D)  speed of sound is inversely proptional to density of medium.
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Answer:
Speed of sound is inversely proportional to density of medium
Explanation:
D)
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