Question

2. A student was sitting on one end of a set of metal bleachers outside of a school building. A drumline was practicing on the other end of the bleachers. Some of the musicians are drumming on the bleachers while others are drumming on their drums. The drumming on drums doesn’t bother the student, but the drumming on the bleachers does because he can feel it in the seat. He moves further away, which helps, but not enough. Finally, he decides to sit on his backpack. Compare the two types of waves the student is detecting. In your response, be sure to include: Why the student can feel the vibrations from the bleachers, but not from the drums. Identification of the two types of waves created by the drumming. A description of two similarities between the two wave types A description of two differences between the two wave types. Why moving away and sitting on the backpack helps him feel the waves less.

Answer 1

The students can feel the vibrations from the bleachers, but not from the drums because of the resonance.

What is the resonance?

The resonance condition occurs when the frequency of a wave matches with the resonance frequency.

The transfer of energy becomes maximum when the natural frequency matches with the frequency generated by the source.

The bleacher and student together having the frequency matching with the resonance frequency of the drum.

The bleacher and student with the bag frequency doesn't match with the resonance value of drums. Secondly, as distance increases sound intensity also decreases.

Thus, the student can feel the vibrations from the bleachers, but not from the drums because of the resonance.

Learn more about resonance.

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