- #1
GUDDU
- 1
- 0
measure of light intensity using a voltmeter?
relationship between voltage and light intensity
relationship between voltage and light intensity
GUDDU said:measure of light intensity using a voltmeter?
relationship between voltage and light intensity
Experimental results of the photoelectric emission
1. For a given metal and frequency of incident radiation, the rate at which photoelectrons are ejected is directly proportional to the intensity of the incident light.
2. For a given metal, there exists a certain minimum frequency of incident radiation below which no photoelectrons can be emitted. This frequency is called the threshold frequency.
3. For a given metal of particular work function, increase in intensity of incident beam increases the magnitude of the photoelectric current, though stoppage voltage remains the same.
4. For a given metal of particular work function, increase in frequency of incident beam increases the maximum kinetic energy with which the photoelectrons are emitted, but the photoelectric current remains the same, though stoppage voltage increases.
5. Above the threshold frequency, the maximum kinetic energy of the emitted photoelectron depends on the frequency of the incident light, but is independent of the intensity of the incident light so long as the latter is not too high [5]
6. The time lag between the incidence of radiation and the emission of a photoelectron is very small, less than 10−9 second.
7. The direction of distribution of emitted electrons peaks in the direction of polarization (the direction of the electric field) of the incident light, if it is linearly polarized
A voltmeter measures the voltage produced by a light-sensitive element, such as a photodiode, in response to the amount of light hitting it. The more light that hits the element, the higher the voltage produced, which can be read on the voltmeter.
The accuracy of a voltmeter in measuring light intensity depends on the sensitivity of the light-sensitive element and the quality of the voltmeter. Generally, a voltmeter can provide accurate measurements within a certain range of light intensity.
No, a voltmeter can only measure visible light as it relies on a light-sensitive element that responds to the wavelengths of visible light. Other types of light, such as infrared or ultraviolet, cannot be measured with a voltmeter.
The units of measurement for light intensity on a voltmeter are typically expressed in volts (V). However, the specific units may vary depending on the sensitivity and range of the voltmeter.
Yes, there are several factors that can affect the accuracy of a voltmeter in measuring light intensity. These include the quality and calibration of the voltmeter, the sensitivity and stability of the light-sensitive element, and external factors such as ambient light and temperature.