An audio speaker producing a steady sound at an outdoor concert is 24 ft away from you. If you move to a position where the speaker is 85 ft distant, by what factor will the amplitude of the sound change

Sound is one of those phenomena whose intensity varies as the inverse square of the distance from the source.

If you're 24-ft from the source and you move to 85-ft from the source, you would expect the sound you hear to get softer, and its intensity to change by a factor of

(24/85)² = 0.0797...

So the sound becomes roughly 8% as loud as it was originally.

(The sound intensity has been reduced by  10.98 dB .)

explanation:

an enlarged virtual image is the answer

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.