Discussion
Which of the following input devices is used to detect orientation and angular velocity?
Answer: B
A gyroscope detects orientation and angular velocity. It is what lets a phone or controller know how it has been turned and how fast. A light pen is a pointing device used on a CRT screen, a magnetometer measures the strength and direction of a magnetic field, as in a compass, and a proximity sensor detects nearby objects without touching them, so none of them measures angular velocity. Phones and game controllers use gyroscopes to sense rotation, which lets a game respond when the device is turned.
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