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

When a loudspeaker is driven by an alternating current, what is the main cause of the audible sound produced in the air?

Why is a low-mass voice coil and diaphragm assembly preferred for reproducing transient sounds (quick attacks such as drum hits)?

Which statement best describes why many modern loudspeakers radiate only a small fraction of the input electrical power as audible sound?

In a moving-coil loudspeaker the magnetic field between the permanent magnet poles is directed from which pole to which pole?

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

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

A small section of voice-coil wire of length 0.65 m carries current 0.020 A in a field of 0.125 T. Use F = BIL to calculate the force and identify which option lists the correct calculation (showing the correct numeric result).

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

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

How does the cone area affect the acoustic output (sound pressure level) produced by a given cone acceleration?

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?