Loudspeakers (physics Only) (ht Only) (GCSE Physics)

What is the physical effect that makes the voice-coil (moving-coil) loudspeaker cone move when an audio electrical signal is applied to the coil?

A loudspeaker is rated for a certain RMS (effective) input power. If the RMS voltage applied to the speaker doubles and the impedance remains approximately constant, what happens to the RMS electrical power delivered to the speaker?

A speaker designer wants to reduce mechanical resonance peaks in a loudspeaker’s response. Which practical measure will help to dampen the resonance?

A loudspeaker cone attached to a coil is driven with a stronger alternating current amplitude. Which immediate change increases the sound pressure level (SPL) produced?

What is the main purpose of the permanent magnet in a moving-coil loudspeaker?

Which of the following best explains why a stronger permanent magnet in the loudspeaker gap tends to increase the speaker’s sensitivity (SPL per watt)?

A loudspeaker cone driven at frequencies well above the speaker’s resonance will generally show which behavior?

Which phenomenon causes some energy to be lost as heat when the voice-coil and magnet assembly moves rapidly inside a metallic structure?

Why does the impedance (effective opposition to AC current) of a typical loudspeaker voice coil tend to increase at higher audio frequencies?

Which of the following explanations correctly states Lenz’s law in the context of a coil moving near a magnet?

In a loudspeaker, if you increase the number of turns of the voice coil (keeping current the same), what is the effect on force for a coil occupying the same magnetic gap?