Science 3rd Quarterly exam

• Speed refers to how fast the object is moving
• Energy is a property of an object or a system that enables it to do work.
• Wave is a disturbance or vibration that transfers energy through matter or space
• Vibration is produced whenever an object or a particle moves back and forth..
• The material through which a wave travels is called a medium
• Wave can only transfer energy and not matter
• Wave transfer energy from one point to another
• Equilibrium position is the stretched position of the wave
• Medium is a material or a substance needed by some of the types of wave to transfer energy
• Equilibrium position refers to the initial horizontal position of wave
• Transverse wave which particles of the medium move in a direction perpendicular to the direction where the waves moves
• Longitudinal wave which particles of the medium move in a direction parrallel to the direction where the wave moves
• The highest point in a transverse wave is called the crest
• The lowest point is know as the trough
• Wavelength is the distance between any successive identical parts of a wave
• Mechanical wave is a disturbance that requires a medium to transfer energy from one place to another
• Electromagnetic wave doesn't need any medium for them to propagate
• Electromagnetic wave is capable of transmitting energy from one location to another in a vacuum
• Compression is the closely spaced parts of the longitudinal wave
• Rarefaction is the stretched parts of the longitudinal wave
• Frequency quantifies the number of vibrations it creates at a given time
• Medium is a material where the waves travel
• Period refers to the time it takes for the particle to have one complete vibration
• Periodic wave is a series of wave pulses travelling in a medium at the same rate
• Wave pulse is a single disturbance that travel along the medium
• Sounds travels fastest and best in solids
• Reflection is the bouncing back of sound. It is also know as echo
• Law of reflection states that the angle of incident sound is equal to the angle of reflected sound
• Refraction is the bending of sound waves
• Diffraction occurs when a sound wave changes direction
• wave can carry energy
• In a water wave, The of motion of the particles are up-down and side-side
• Vibration can cause a wave
• Oscillation is the motion of an object if it moves up and down or left or right on its own position
• The equilibrium position of a rope is when it is fully stretched
• Matter cannot be transferred by a wave
• The rolling ball on a plane is not an example of a wave
• Medium is any matter in which sound can propagate on
• heat cannot be a medium for waves
• The particle in a medium go back to their original position once the disturbance has already passd