This question examines the roles that resonance plays in some everyday objects and…
CHEMISTRY · Multi-part · ISC · Chemistry · Physics · Chemical Bonding and Molecular Structure
Problem
This question examines the roles that resonance plays in some everyday objects and processes.
(1) Many music speakers are housed inside wooden or plastic boxes. Sometimes, when music is playing, the box oscillates and produces unwanted noise. Outline the role that resonance is playing when the box makes this unwanted noise. Suggest how high-quality speaker cabinets may be designed to overcome this problem.
(2) Microwave ovens heat up food very quickly. Outline how microwave ovens use the phenomenon of resonance.
(3) In 2000, the Millenium Bridge across the river Thames in London had to be closed two days after it opened. With 2000 people walking on it, the bridge began to oscillate laterally with a dangerously large amplitude. Outline the role that resonance played and how engineers were able to redesign the bridge to avoid such dangerous oscillations.
(4) Some modern skyscrapers are built in places where there may be an earthquake. Suggest how such skyscrapers might be designed to protect them from the damaging effects of resonance.
(5) A radio receiver can be 'tuned' to receive different broadcasts from radio stations. Outline the role that resonance plays in a radio receiver.