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Physics · Class 10
D.c. flows in one direction; a.c. reverses periodically.
Acoustic lensing uses designed materials or structures to control and focus sound.
Alpha, beta and gamma are the three main types of nuclear radiation studied at this level.
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.
