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A ticking clock is clearly audible in a quiet room. A vacuum cleaner turns on nearby and the ticking disappears under the motor noise.

C3-3-01 Environment Transition · sound_attenuation principle: Environmental Masking (Wave)
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Per-prompt rubric

Basic standards

Visual presence

  • a clock
  • a vacuum cleaner
  • a room

Event: a vacuum cleaner turns on near a ticking clock in a room

Audio presence

  • a clock
  • a vacuum cleaner

Sound: ['clock ticking', 'vacuum cleaner motor noise']

Key standards

Visual physical commonsense (V-PC)

  • A clock with a visible face and a vacuum cleaner are both shown, and the vacuum is turned on by a person during the clip while the clock remains visible throughout.

Audio physical commonsense (A-PC)

  • Clock ticking is clearly audible before the vacuum starts, and the ticking becomes inaudible once the vacuum motor noise is active.

Cross-modal physical commonsense (AV-PC)

  • The disappearance of the ticking aligns in time with the visible moment the vacuum cleaner turns on.