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Sound is a disturbance of matter (a pressure wave) that is transmitted from its source outward. Hearing is the perception of sound. Sound can be modeled in terms of pressure or in terms of displacement of molecules. The human ear is sensitive to frequencies between 20 Hz and
In physics, the sound is defined as. A vibration that propagates as an audible wave of pressure, through a medium such as a gas, liquid or solid. In psychology, the sound is defined as. The reception of sound pressure waves and their perception by the brain.
Sound is a form of energy that is transmitted through the air in the form of waves. It is created by vibrations, which enter the ear and cause tiny hairs to vibrate. The brain then interprets these vibrations as sound. The human ear is able to hear sound waves from 20-20000 Hz.
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Topic covers :
Transverse Wave,
Longitudinal Wave,
Wave intensity,
Pitch,
Doppler Effects.

Exam-Utility: UPSC CSAT, Prelims, Mains, CDS, CAPF,SSC CGL, MPSI,MPPSC,BPSC,RAS/RTS
पढ़ाई करते समय नींद आने से बचने के लिए ये उपाय अपनाए जा सकते हैं:
पढ़ाई करते समय सीधे बैठें और अपने पोस्चर का ध्यान रखें.
पढ़ाई से पहले कम मात्रा में भोजन करें. भारी भोजन करने से सुस्ती आती है.
पढ़ाई करते समय बीच-बीच में पानी पिएं.
पढ़ाई करते समय बोल-बोलकर या लिखकर पढ़ें. इससे दिमाग सतर्क रहता है.
पढ़ाई करते समय रफ़ कॉपी या स्टिकी नोट्स रखें.
पढ़ाई करते समय ज़ोर से पढ़ें.
पढ़ाई करते समय मनपसंद गाना सुनें.
पढ़ाई करते समय बीच-बीच में आंखों को धोएं.
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पढ़ाई करते समय कुर्सी-टेबल पर बैठें, न कि बिस्तर पर.
पढ़ाई करते समय दो घंटे के बाद थोड़ी देर टहलें या हल्की एक्सरसाइज़ करें.
सुबह उठने के बाद तुरंत पढ़ाई न करें, बल्कि सबसे पहले ताज़ी हवा लें और टहलें.
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