The Doppler effect in sound wave
The Doppler effect is a phenomenon observed in waves, including sound waves, where there is a perceived change in frequency or wavelength of a wave d…
Features
Evidence of big bang theory
Evidence of big bang theory The Big Bang theory is supported by a wide range of observational evidence from various fields of astronomy, physics, and…
Forces and Motion (O-Levels)
Forces and Motion Acceleration: The rate of change of velocity. It can be calculated from the gradient of a velocity-time graph. Balanced Forc…