13. Use what you know about interference to construct the resulting wave when th

Question

13. Use what you know about interference to construct the resulting wave when the following waves meet up. To do so, place a dot at each marked position () showing the resultant of the two waves at that point. Then sketch from dot to dot to complete the shape of the wave. Trace your final wave with a colored marker so it is clearly visible a. 14. A wave of amplitude 0.3 m interferes with a second wave of amplitude of 0.2 m. What is the largest resultant displacement that may occur as a result of interference? Station #4 Resonance 15. A tuning fork consists of two metal prongs that vibrate at a single frequency when struck lightly. What will happen if a vibrating tuning fork is placed near another tuning fork of the same frequency? Explain why 16. Although soldiers are usually required to march together in step, they must break their march when crossing a bridge. Explain the possible danger if an army were to cross a bridge without taking this precaution and continue to march across

Explanation / Answer

14) 0.2+0.3 = 0.5m

15) First tuning fork forces another tuning fork into vibrational motion at the same natural frequency. The two forks are connected by the surrounding air particles. As the air particles surrounding the first fork (and its connected sound box) begin vibrating, the pressure waves that it creates begin to impinge at a periodic and regular rate upon the second tuning fork (and its connected sound box). The energy carried by this sound wave through the air is tuned to the frequency of the second tuning fork. Since the incoming sound waves share the same natural frequency as the second tuning fork, the tuning fork easily begins vibrating at its natural frequency. This is an example of resonance - when one object vibrating at the same natural frequency of a second object forces that second object into vibrational motion.

The result of resonance is always a large vibration. Regardless of the vibrating system, if resonance occurs, a large vibration results.

16) If soldiers march in unison across the structure, they apply a force at the frequency of their step.

If their frequency is closely matched to the bridge's frequency, the soldiers' rhythmic marching will amplify the vibrational frequency of the bridge. If the mechanical resonance is strong enough, the bridge can vibrate until it collapses from the movement.

True/False

c) False

d) False

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