Learning objective -- Beats
- 1. Learning Objective ---Beats Hedy Liang (19403147) Lab Section: L2F
- 2. What is a beat? When we listen to two waves that have slightly different frequencies, we hear the amplitude increasing and decreasing as a function of time. This type of variation in amplitude is called a beat. Beats
- 3. Beats Beats are caused by the interference of two vaces at the same point in space. The plot below shows the periodic increase and decrease for two sine waves.
- 4. The point C in the graph is Constructive interference and Point D is destructive interference. Beats
- 6. The beat frequency refers to the rate at which the volume is heard to be oscillating from high to low volume. For example, if two complete cycles of high and low volumes are heard every second, the beat frequency if 2Hz. The beat frequency is always equal to the difference in frequency of the two notes that interfere to produce the beats. Beat Frequency
- 7. For equal amplitude sine waves, the sum rule is followed by the equation: The beat frequency is given by Sum and Difference Frequencies
- 8. Beat Frequency A 100 Hz tone and a 105 Hz tone are played simultaneously. What is the beat frequency? Check Your Understanding
- 9. (B) 5Hz The amplitude will be large for both the positive and negative crests; therefore, the amplitude modulations have the same frequency as the difference between the two frequencies. Answer