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Q24 (NDA-I/2008) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Waves and acoustics Answer Verified

Some common mediums in which speed of sound waves is measured are mentioned below: 1. Air 2. Steel 3. Copper 4. Water What is the correct increasing order of the speed of sound?

Result
Your answer: —  Â·  Correct: C
Explanation

The speed of sound depends on the medium's state, generally traveling fastest in solids, followed by liquids, and slowest in gases [t1][t5]. This is because solids have higher elasticity and a more rigid structure, allowing them to respond more rapidly to disturbances [c1][t9]. Among the given mediums, Air (gas) has the lowest speed at approximately 343-346 m/s [t2][t4]. Water (liquid) follows with a speed of about 1433-1482 m/s [t2]. In solids, the speed is significantly higher. While both are metals, the speed of sound in Steel (approx. 5960 m/s) is higher than in Copper (approx. 3750-4700 m/s) due to differences in Young's modulus and density [t5][t9]. Therefore, the correct increasing order is Air < Water < Copper < Steel (1 < 4 < 3 < 2).

Sources

  1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 5: Earths Magnetic Field (Geomagnetic Field) > Why Do Sound Waves Travel Faster In A Denser Medium Whereas Light Travels Slower? > p. 64
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