Measure Light with Google’s Science Journal App

Measure Light with Google’s Science Journal App


You can use Google’s Science Journal to measure
light levels using your phone. Open an experiment then open the light sensor
by swiping up on the gray toolbar in the middle of the screen and tapping the sensor icon. Then select the light bulb icon from the list
of available sensors. You might have to scroll sideways to find
it if you don’t see it at first. On Android devices, light levels are measured
using the phone’s built-in light sensor, and are reported in lux. On iOS devices, light levels are measured
using the front-facing camera, and reported in EV. You can tap the “i” icon to learn more about
the units used in each operating system. The app will display both the instantaneous
reading and a graph showing how the reading changes over time. You can record data by tapping the record
button and take a single reading by tapping the snapshot button. In order to take accurate measurements, it’s
important to find the exact location of the light sensor on your phone. You can do this by placing the phone under
a bright light and slowly waving your fingertip around in front of the phone. When your finger blocks the light sensor,
the light reading should drop. When your finger moves away, the reading should
go back up. Try using the light sensor to do some simple
experiments. For example, how do ambient light levels change
at different times of day? Or how does the brightness of a light source
change with distance? To learn more about Google’s Science Journal
app, and see a list of fun experiments you can do with the app, click the link at the
end of this video.

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