Final answer:
The sensor found in certain smartphones is the C) Accelerometer, which is used for detecting orientation and movement of the phone. Other options like the Geiger-Müller tube, Barometer, and Spectrometer are not as common, with the Barometer sometimes being present and the latter two not typically found in smartphones.
Step-by-step explanation:
To answer the question of which sensor is found in certain smartphones, the correct option is C) Accelerometer. An accelerometer is a device that measures the acceleration forces acting on the phone, whether they're due to gravity or the user moving the phone. This sensor is commonly used in smartphones for functions such as determining the orientation of the phone (to rotate the screen from portrait to landscape) and for step-tracking in fitness applications.
In contrast:
- A Geiger-Müller tube, as depicted in photo a, is used in a Geiger counter to detect and measure radiation. It is not a component typically found in smartphones.
- A Barometer measures atmospheric pressure and can be found in some smartphones to assist with altitude estimation and weather forecasting.
- Spectrometers, which are referred to in part D of the additional information, are used to analyze the spectrum of light, and they are not common in smartphones. This tool is more specialized and not typically included as a standard feature.