Human hearing range describes the range of frequencies that can be heard by humans. Accordingly humans can detect sounds in a frequency range from about 20 Hz to 20000 Hz. Humans are most sensitive to frequencies between 2,000 and 5,000 Hz. And also sounds we can’t hear that is below 20 Hz (Infra-sound) and above 20000 Hz (Ultrasound) can still hurt our ears. Therefore we can conclude that we can’t hear all the sounds of our surrounding.
වැසූ ශාලාවෙන් හඬක් පිටවීමට නොහැකි නිසා ඒවා බිත්තිවල වැදී ආපසු පරාවර්තනය වේ. එම හඬ නැවත…
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Transistors are one of the basic building blocks of modern electronics. The first working transistor…