Sound wave properties
Sound wave properties is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2014, 2024). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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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 विधने सत्य की असत्य ते लिहा. (I) आवाजाच्या प्रसारासाठी माध्यमाची गरज असते. (II) आवाजाच्या वारंवारतेचे हर्ट्झ हे एकक आहे. (III) आवाजाची तीव्रता मोजण्यासाठी डेसिबल हे एकक आहे. Say whether following sentences are true or false : (I) For propagation of sound medium is necessary. (II) Unit of frequency of sound is Hertz. (III) Loudness of sound is expressed in decibel unit.
All given statements are correct: Sound requires a material medium for propagation, frequency is measured in Hertz (Hz), and loudness/intensity is measured in decibels (dB).