Video two waves meet while travelling along the same medium. Loud Thunder? warmer air Cooler airĢ0 Interference two waves meet while travelling along the same medium. Sound wave closest to the ground is slowest, and the wave farthest above the ground is travelling the fastest. Sound waves bends “away the normal” During the night the air is cooler near the ground and warmer away from ground. Person standing in the shadow zone will not hear the sound even though he/she might be able to see the source A "shadow zone" region created in which sound wave cannot penetrate. denser medium Less dense mediumĭay time – sound bends upwards. Sound wave closest to the ground is fastest, and the wave farthest above the ground is travelling the slowest. Sound waves bends “towards the normal” During the day the air is warmest near the ground and cooler away from ground. Incident wave direction Wavelength decreases as wave travels from less dense to denser medium. Same inverted Transmitted wave smaller slower Same as sourceĪpplet Video: ripple tank Water waves travelling from less dense to denser medium: Speed decreases Frequency remains the same wavelength decreases All are “crests” of a transverse waveġ1 Refraction Consider transmission of the rope wave from less dense medium ( the thin rope) towards the boundary with a more dense medium (the thick rope).ġ2 Refraction wavelength frequency speed Type Reflected wave It is perpendicular to the wave fronts.Īll the particles along the wave fronts are in phase. These lines represent wave fronts Wave fronts is a imaginary line that joins up particles of the same phase together. Wavelength remains the same λ Law of reflection: angle i = angle r ![]() ![]() Remains the same Decreases Speed Wavelength Amplitude ![]() Last particle is free to move.ħ Free-end Reflection Reflected pulse is not inverted. Rope is attached to a loosely-fit ring around the pole. Wavelength Amplitude Remains the same Decreases Reflected pulse in inverted A portion of energy is transmitted to the pole The disturbance returns to the source (left side)ĥ Fixed-end Reflection What happens to the wave characteristics? Speed The last particle is fixed at position and unable to move.Ĥ Fixed-end Reflection When the incident pulse reaches the boundary: Does reflection of a wave affect the speed of the wave? The behavior of a wave (or pulse) upon reaching the end of a medium is referred to as boundary behavior.ģ Fixed-end Reflection Rope is connected to a pole.Īpplet applet Rope is connected to a pole. Wave Behavior Reflection Refraction Diffraction Interference Doppler EffectĢ Boundary Behavior A sound wave travelling through water reflects off the submarine and returns to its original source.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |