Speed of sound
Speed of sound is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2014, 2016). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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Real questions that test this
खालीलपैकी योग्य वाक्यांची निवड करा. / Choose correct statements from the following :
(a)ध्वनिहरी वायू पदार्थापेक्षा स्थायू पदार्थातून वेगाने जातात. / Sound waves travel faster in solids than in gases.
(b)ध्वनिहरी निर्वात पोकळीतून सर्वात जलद गतीने जातात. / Sound waves travel fastest through vacuum
(c)ध्वनिहरी अनुलंभ लहरी आहेत. / Sound waves are longitudinal waves
(d)ध्वनिहरी द्रव पदार्थापेक्षा वायू पदार्थातून कमी वेगाने जातात. / Sound waves travel slower in gases than in liquids.
Sound waves travel fastest in solids (a), are longitudinal waves (c), and travel slower in gases than in liquids (d). Statement (b) is false because sound cannot travel through a vacuum at all.
खालील विधानांचा विचार करा : वरीलपैकी कोणते विधान सत्य आहेत ? Consider following statements : Which of the above statements are true ?
(a)दाट धुके असलेल्या रात्री दूरवरून जाणाऱ्या आगगाडीची शिट्टी स्पष्टपणे ऐकू येते. The whistle of a passing train is clearly heard on a quiet misty night.
(b)ध्वनिचा हवेतील वेग हा हवेच्या आद्रतेच्या समानापाती असतो. Velocity of sound in air is proportional to humidity in air.
On a misty night, sound waves refract due to temperature gradients making distant sounds clearer, and the velocity of sound increases directly with air humidity.