lent Name: Wave Reflection Class: / Date: 1. Sketch a wave reflecting from a surface. Show the angle of incidence and angle of reflection from a line normal to that surface. 2. According to the law of reflection what is the relationship between angle of incidence and angle of reflection. 3. Reflection of sound waves from a surface creates 4. Reflection off a smooth have a tendency to direct reflected wave in a specific direction; whereas reflection from a rough will direct the reflected wave in different directions. 5. Walls and ceilings of concert halls are made of softer materials to sound waves to avoid of sounds.Name: 13.Doppler Effect The Doppler Effect is an observed change in sound frame when there is relative motion between the source of waves and an observer. Because _ Stoute determines pitch, the Doppler Effect affects the pitch heard by listener. Stationary Observer: Moving Source Approaching ambulance Apparent wavelength 1. When the source (ambulance) is moving towards the man, he hears a sound wave that has: Wavelength ()) _more/less than the wave from source; Frequency Receding ambulance Apparent wavelength (1)_more more/less than the wave from source; Pitch more/less than the wave from source 2. When the source (ambulance) is moving away from the man, he hears a sound wave that has: Wavelength (A) mart _more/less than the wave from source; Frequency (f) more/less than the wave from source; Pitch more/less than the wave from source 3. The changed pitch of the Doppler Effect is due to changes in a. wave speed b. wave frequency 1. Why are the waves closer together in the top picture? 5. How would the wave pattern change in top picture if the ambulance moved at a faster speed? How would it sound different to the observer?student Wave Refraction Class: / Date: 03/03 / 23 1. The bending of a wave when it goes from one medium to another is called rel raced tohit happens because of wave changes when it goes from one medium to another. 2. Sketch a sound wave refracting from air into a thick glass sheet. Show the angle of incidence and angle of refraction from a line normal to the glass surface. 3. Since the density of glass is more than that of air, the sound wave refracting at the boundary of glass sheet will travel in glass with (equal, more, less a. speed than that of sound wave speed in air. b. Wavelength than that of sound wave in air. C. Frequency to that of sound wave in air. d. And is bent [towards/away) the normal line. 4 Sound waves travel faster in than than herause vibrations can be transferred quickly if the particles of the medium are closer to each other (air, steel, water, vacuum) 5. Sound waves can't travel in a because sound is a mechanical wave and needs a medium to travel through. 6. Higher density slows down the wave because of