Chemical Effects of Electric Current


TOPIC 1: Sound is produced by a vibrating body.
TOPIC 2: Musical instruments produce sound
TOPIC 3: Sound produced by humans  (View Demo)
TOPIC 4: Sound needs a medium for propagation
TOPIC 5: We hear sound through our ears
TOPIC 6: Wave length , amplitude, time Period and frequency of a sound
TOPIC 7: Loudness of sound
TOPIC 8: Pitch of sound
TOPIC 9: Music and noise
TOPIC 10: Audible and inaudible sound
TOPIC 11: Noise pollution
TOPIC 12: How to control noise pollution
Multiple choice questions
Question and answers
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