at the same time, whereas harmonics may refer to just a single multiple being sounded at a given time. It’s just a guess. Harmonics in a pipe open at one end Harmonics in a pipe open at both ends *Quality The quality of a note depends upon the number of overtones present in the note It also depends upon the relative strengths of the different overtones present. In practice, when a musical instrument emits a given note (corresponding to a certain frequency), it will also emit a number of overtones, but at lower strengths. Different instruments emit different combinations of overtones, and at different strengths. Pythagoras and music Pythagoreans discovered that was pleasing if two strings of the same type and tension have lengths in the simple ratio 2:1, 3:2 or other simple rations these sound harmonious. – More complex ratios are discordant and unpleasant to the ear and often produce beats which are – uncomfortable. Try this with an online signal generator Exam questions [2006 OL] The of sound depends on the medium through which the sound is travelling. Explain how sound travels through a medium. Why is the speed of sound greater in water than in air? [2006 OL][2008 OL] Describe an experiment to demonstrate that sound requires a medium to travel. [2008 OL] The diagram a signal generator connected to two loudspeakers emitting the same note. A person walks slowly along the line AB. What will the person notice? Why does this effect occur? does this tell us about sound? [2005 OL] In an experiment, a signal generator was connected to two loudspeakers, as shown in the diagram. Both speakers are emitting a note of the same frequency and same amplitude. A person walks along the line XY. Describe what the person hears. What does this experiment demonstrate about the nature of sound? [2005][2003] Describe an experiment to show that sound is a wave motion. [2004 OL] Describe an experiment to demonstrate the interference of sound. [2007 OL][2010 OL] Explain the term natural frequency.
at the same time, whereas harmonics may refer to just a single multiple being sounded at a given time. It’s just a guess. Harmonics in a pipe open at one end Harmonics in a pipe open at both ends *Quality The quality of a note depends upon the number of overtones present in the note It also depends upon the relative strengths of the different overtones present. In practice, when a musical instrument emits a given note (corresponding to a certain frequency), it will also emit a number of overtones, but at lower strengths. Different instruments emit different combinations of overtones, and at different strengths. Pythagoras and music Pythagoreans discovered that was pleasing if two strings of the same type and tension have lengths in the simple ratio 2:1, 3:2 or other simple rations – these sound harmonious. More complex ratios are discordant and unpleasant to the ear – and often produce beats which are uncomfortable. Try this with an online signal generator Exam questions [2006 OL] The of sound depends on the medium through which the sound is travelling. Explain how sound travels through a medium. Why is the speed of sound greater in water than in air? [2006 OL][2008 OL] Describe an experiment to demonstrate that sound requires a medium to travel. [2008 OL] The diagram a signal generator connected to two loudspeakers emitting the same note. A person walks slowly along the line AB. What will the person notice? Why does this effect occur? does this tell us about sound? [2005 OL] In an experiment, a signal generator was connected to two loudspeakers, as shown in the diagram. Both speakers are emitting a note of the same frequency and same amplitude. A person walks along the line XY. Describe what the person hears. What does this experiment demonstrate about the nature of sound? [2005][2003] Describe an experiment to show that sound is a wave motion. [2004 OL] Describe an experiment to demonstrate the interference of sound. [2007 OL][2010 OL] Explain the term natural frequency.
17-sound.docx