waves

• waves are a vibration in both space & time
• mechanical waves are waves that require a medium to travel
• electromagnetic waves are waves that do not require a medium to travel
• the direction of a transverse wave is perpendicular to the direction of motion of particles
• a longitudinal wave is a direction of a wave that is parallel
• reflection is the bouncing back of the wave
• refraction is the bending of the wave
• diffraction is the bending of the wave through a small opening
• interference is the interaction of two waves when they meet
• a vibration is a wiggle or movement in time
• point on the wave that exhibits the maximum amount of negative or downward displacement from the equilibrium position is called trough
• wavelength is the distance from one crest to another crest
• velocity is the speed of the wave
• frequency is the number of wave the past unit time
• the point on the wave that exhibits the maximum displacement from the equilibrium position is the crest
• point on the wave that exhibits the maximum amount of negative or downward is the trough
• point on the wave which has the maximum density is called compression
• point on the wave which has minimum density is the rarefraction
• amplitude is the maximum distance that a particle is displaced from its equilibruim position
• period is the time taken for a particle of a wave to make one complete cycle
• constructive interference happens when a crest of the first wave meets the crests of the second wave
• destructive interference happens when the crests of the first wave meet the troughs of the second wave
• destructive interference may produce a wave of zero amplitude
• constructive interference produce a wave of higher amplitude
• radio waves have the longest wavelength and lowest frequency
• gamma rays have the shortest wavelength and highest frequency
• gamma rays are used in radiation in therapy to kill cancer cells
• seismology is the study of earthquakes that move through and around the earth
• scientists who study earthquakes is called seismologist
• body waves have 2 waves , namely p-waves and s-waves
• surface have 2 types, love waves and rayleigh waves