Photo cell is a device toa) Store photons b) Measure light intensity c) Convert photon energy into mechanical energy d) Store electrical energy for replacing storage batteries Correct answer is option 'B'. Can you explain this answer?

Question

Photo cell is a device toa)                                  Store photons                               b)                                  Measure light intensity                               c)                                  Convert photon energy into mechanical energy                               d)                                  Store electrical energy for replacing storage batteries                               Correct answer is option 'B'. Can you explain this answer?

Answer

Photocell, also called electric eye, an electron tube with a photosensitive cathode that emits electrons when illuminated and an anode for collecting the emitted electrons. It is used to convert energy of photons into mechanical energy.

Answer

Photo cell is used to convert photon energy(I.e. light energy) into chemical energy....

Answer

Introduction:
A photo cell, also known as a photocell or a photoresistor, is a device that is used to measure the intensity of light. It is an important component in various electronic circuits and devices.

Explanation:
1. Function of a photo cell:
A photo cell works on the principle of photoconductivity. It is made up of a semiconductor material that exhibits changes in its electrical conductivity when exposed to light. When light falls on the photo cell, the photons in the light interact with the material, causing the generation of free electrons. This, in turn, leads to a change in the electrical properties of the material.

2. Measuring light intensity:
The primary function of a photo cell is to measure the intensity of light. As light falls on the photo cell, it generates a corresponding electrical current or voltage. This electrical output is proportional to the intensity of the incident light. By measuring this output, the intensity of light can be determined.

3. Structure and working principle:
A photo cell typically consists of a semiconductor material such as cadmium sulfide (CdS) or silicon. The semiconductor material is exposed to light through a transparent window. When light strikes the material, it excites the electrons, causing them to move from the valence band to the conduction band. This creates a flow of current within the material.

4. Applications:
Photo cells find applications in various fields, including:
- Light sensors: They are used in automatic lighting systems, streetlights, and photography equipment.
- Solar panels: They are used to convert sunlight into electrical energy in solar panels.
- Industrial automation: They are used in industrial settings for monitoring light levels and triggering certain actions.
- Burglar alarms: They are used in security systems to detect changes in light levels and trigger alarms.

Conclusion:
In conclusion, a photo cell is a device that is used to measure the intensity of light. It works by converting the energy from photons into an electrical output. This device finds applications in various fields and is an essential component in many electronic circuits and devices.

Answer

Tzyzpuxyjfggz ffh

Similar NEET Doubts

At t = 0, light of intensity 1012 photons/s–m2 of energy 6eV per photon start falling on a plate with work function 2.5 eV. If area of the plate is 2 × 10-4 m2 and for every 105 photons one photoelectron is emitted, charge on the plate at t = 25 s is

A hydrogen atom is in the 4th excited state, then

Two charges 3.2×10^-19 C and -3.2×10^-9 C kept 2.4A apart forms a dipole.if ot is lept in uniform electric feild of intensity 4×10^5 volt/m then what will be its electrical energy in equilibrium ?

A special kind of light bulb emits monochromatic lightof wavelength 700 nm . Electrical energy supply to it at the rate of 60 W. .and bulb is 50% efficient at converting that energy to light energy . How many photons are emitted by bulb during its life time of 1 day?

A 200 W sodium street lamp emits yellow light of wavelength 0.6micrometre. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is? Answer is 1.5 x 10^20. Can anybody answer this?

Top Courses for NEETView all

Biology Class 11

Daily Test for NEET Preparation

NEET Mock Test Series 2025

Topic-wise MCQ Tests for NEET

Physics Class 11

Top Courses for NEET

Top Courses for NEET

Suggested Free Tests

Related Content

About NEET

NEET Preparation Material

How to Prepare for NEET Exam?

NCERT Based Study Material

NEET Mock Tests

Other Popular Exams

Company