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Physics · Class 10
CONTENTREQUIREDFROM_CHATGPT
D.c. flows in one direction; a.c. reverses periodically.
Acoustic lensing uses designed materials or structures to control and focus sound.
Analogue signals vary continuously; digital signals use discrete levels such as binary 0 and 1. ADC converts analogue to digital; DAC converts digital to analogue.
Waveform analysis shows amplitude, frequency, period and shape.
Most liquids shrink as they cool. Water is unusual between 0 C and 4 C: it expands as it cools toward 0 C, so ice is less dense than liquid water and floats.
