Bellwork

• The diagram above shows 2 pulses with identical wavelengths, traveling toward each other at equal speeds in a rope.

• Create a diagram that best represents the shape of the rope when both pulses are in Region AB

• I will grade this 3 minutes after the bell rings

What is doppler?

• Where have you heard this before?• What is it named after?

• An ambulance is traveling away from you. The frequency of the sound wave of the siren seems to ….

• Which of the following does not apply to a sound wave?– Reflection?– Refraction?– Diffraction?– Polarization?

Resonance

• Natural frequency: the frequency at which an object oscillates by itself.

• Resonance: system driven at its natural frequency