Which smartphone sensor collects information about physical activity for health apps?

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Multiple Choice

Which smartphone sensor collects information about physical activity for health apps?

Movement data is what health apps rely on to track physical activity, and the accelerometer provides this by measuring acceleration along the phone’s three axes as you move. By analyzing the cadence and intensity of that acceleration, apps can count steps, estimate distance, and gauge activity level. Other sensors serve different purposes: the proximity sensor detects when something is near the screen, not motion; the gyroscope measures rotation and orientation, which helps with stability and orientation but not the raw activity signal; the magnetometer detects magnetic direction for compass functions. Therefore, the accelerometer is the sensor that collects information about physical activity for health apps.

Movement data is what health apps rely on to track physical activity, and the accelerometer provides this by measuring acceleration along the phone’s three axes as you move. By analyzing the cadence and intensity of that acceleration, apps can count steps, estimate distance, and gauge activity level. Other sensors serve different purposes: the proximity sensor detects when something is near the screen, not motion; the gyroscope measures rotation and orientation, which helps with stability and orientation but not the raw activity signal; the magnetometer detects magnetic direction for compass functions. Therefore, the accelerometer is the sensor that collects information about physical activity for health apps.

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