Which one of the following measuring instruments is used to measure light intensity? A. Galvanometer B. Photo meter C. Current meter D. Volt meter
Answer (1)
To measure light intensity, the appropriate instrument from the options given is a photo meter, also known as a photometer. Therefore, the correct choice is B. Photo meter.
Photometers are devices specifically designed to measure the strength or intensity of light. They work by capturing light and converting it into an electrical signal. This signal is then used to determine the intensity level of the light.
Here's a step-by-step explanation of how photometers work:
Light Detection : The photometer uses a photosensitive element, such as a photodiode or a phototransistor, which responds to light and converts it into an electrical current.
Signal Conversion : This resulting electrical current or voltage is proportionate to the intensity of the light that hits the photosensitive element.
Measurement : The photometer reads this electrical signal and translates it into a numerical light intensity reading, often displayed in units like lux or lumens.
Photometers are commonly used in various fields, including physics experiments, photography to determine the correct exposure, and environmental science to monitor sunlight levels for studies on plant growth.
In summary, option B. Photo meter is the correct instrument for measuring light intensity. The other options listed, such as galvanometer (related to electrical current), current meter (for measuring electric current), and volt meter (for measuring voltage), do not measure light intensity.
