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प्रश्न
Photo diodes are used to detect ______.
पर्याय
radio waves
gamma rays
IR rays
optical signals
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उत्तर
Photo diodes are used to detect optical signals.
Explanation:
A photodiode is a semiconductor device that converts light energy into electrical current. It is mainly used to detect light or optical signals in communication systems and electronic devices. Hence, the correct answer is optical signals.
संबंधित प्रश्न
The one parameter that determines the brightness of a light source sensed by an eye is ____________ .
As the wavelength is increased from violet to red, the luminosity ____________ .
An electric bulb is hanging over a table at a height of 1 m above it. The illuminance on the table directly below the bulb is 40 lux. The illuminance at a point on the table 1 m away from the first point will be about ___________ .
The intensity produced by a long cylindrical light source at a small distance r from the source is proportional to _________ .
A point source of light moves in a straight line parallel to a plane table. Consider a small portion of the table directly below the line of movement of the source. The illuminance at this portion varies with its distance r from the source as ___________ .
A room is illuminated by an extended source. The illuminance at a particular portion of a wall can be increased by
(a) moving the source
(b) rotating the source
(c) bringing some mirrors in proper positions
(d) changing the colour of the source.
A photographic plate records sufficiently intense lines when it is exposed for 12 s to a source of 10 W. How long should it be exposed to a 12 W source radiating the light of same colour to get equally intense lines?
A light source emits monochromatic light of 555 nwavelengthm. The source consumes 100 W of electric power and emits 35 W of radiant flux. Calculate the overall luminous efficiency.
Figure shows a small diffused plane source S placed over a horizontal table-top at a distance of 2.4 m with its plane parallel to the table-top. The illuminance at the point Adirectly below the source is 25 lux. Find the illuminance at a point B of the table at a distance of 1.8 m from A.
Light rays from a point object ______.
