Even when the screen is completely dark while the film is in motion,…
2013
Even when the screen is completely dark while the film is in motion, commercial motion pictures use _____.
- A.
32 frames per second or 102 screen illuminations per second
- B.
72 frames per second or 234 screen illuminations per second
- C.
8 frames per second or 32 screen illuminations per second
- D.
24 frames per second or 72 screen illuminations per second
Attempted by 363 students.
Show answer & explanation
Correct answer: D
Answer: 24 frames per second, resulting in about 72 screen illuminations per second. Explanation: A motion picture is a sequence of still images projected quickly to create the illusion of continuous motion.
The human eye needs roughly at least 16 illuminations per second to perceive smooth motion; lower rates produce noticeable flicker.
Commercial films use 24 frames per second. Projectors interrupt the light several times per frame (commonly three interruptions), so each frame is shown multiple times per second.
Multiplying 24 frames per second by three light interruptions gives about 72 screen illuminations per second, which prevents flicker.