Share PHYSICS (waves, motion, electricity)
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What is the formula for wave speed?
Wave speed = frequency × wavelength
What is the unit of frequency?
Hertz (Hz)
Differentiate between transverse and longitudinal waves.
Transverse: Oscillations are perpendicular to wave direction. Longitudinal: Oscillations are parallel to wave direction.
What property of a wave changes when it enters a denser medium?
Speed and wavelength decrease.
What is the speed of electromagnetic waves in a vacuum?
3×10^8 m/s.
What happens to the frequency of a wave during refraction?
It remains constant.
Name two examples of longitudinal waves.
Sound waves, seismic P-waves.
What is the formula for calculating speed?
Speed= distance/time
Define acceleration.
The rate of change of velocity.
State the units for speed, velocity, and acceleration.
Speed: m/s, Velocity: m/s, Acceleration: m/s2 .
What is the SI unit of force?
Newton (N).
Newton (N).
Work done is force multiplied by distance in the direction of the force.
What is the formula for kinetic energy?
KE= 1/2 mv2
State the formula for electrical power.
P=IV
What is the unit of electric charge?
Coulomb (C).
Define current.
The flow of electric charge.
