Describe the relationship between Energy, Work, and Power. Check all that apply.
Power is defined as work done per unit time.
Energy is work divided by mass and time.
Energy is the capacity to do work.
Work is energy transformed into a movement rate.
Power is work in the form of latent energy.
What is Light?
Radiant energy that is capable of exciting the retina and producing a visual sensation.
Thermal energy that passes through the retina and creates what we know as light.
Latent energy that bounces off of the retina before creating a visual sensation.
Kinetic energy that occurs when the sun lets off some steam and it travels around before finally stopping on earth to create a little thing we know and love, light.
Describe the difference between radiometric and photometric measurement.
Radiometry measures electromagnetic radiation including visible light, while photometry measures the effects of visible light.
Photometry measures electromagnetic radiation including visible light, while radiometry measures the effects of visible light.
Radiometry measures radiation, while photometry measures the amount of light in a given frame.
Photometry measures electromagnetic radiation including visible light, while radiometry measures only radiation.
Describe photometry and what it measures:
A characterization of light's interaction with the human eye. It measures the effects of visible light.
A characterization of light's interaction with the human eye. It measures the light efficacy.
How light interacts with it's surroundings. It measures the effects of visible light.
How light interacts with it's surroundings. It measures the light efficacy.
What does radiometry measure?
It measures electromagnetic radiation including visible light.
It measures the effects of visible light.
It measures how far radio waves can travel.
It measures how often your microwave emits toxic radiation.
What is the difference between Luminance and Illuminance?
Illuminance is the light emitted per unit of space and Luminance is the measure of light intensity on a surface.
Illuminance is the measure of light intensity on a surface and Luminance is the light emitted per unit of space.
Illuminance is measure the amount of light that we get during the day and Luminance measures the amount we get during the night.
Illuminance is measure the amount of light that we get during the night and Luminance measures the amount we get during the day.
What is Luminance?
The measure of light intensity on a surface.
The light emitted per unit of space.
The measure of light we get during the day.
The measure of light we get at night.
What is Illuminance?
The measure of light during the day.
The measure of light during the night.
What is Luminous Intensity?
Measure of the wavelength weighted power emitted by a light source in a specific direction.
Measure of how harsh the light can become during the day time.
Measure of light wavelengths depending on a certain time of day and where the light source is.
Measure of how much time it takes for light to decay.
What is a candela?
Unit of measurement for intensity of light.
Unit of measurement for intensity of sound.
Unit of measurement for intensity of wind.
Literally no one cares.
How do we measure Lumens and Lux.
Using an integration sphere.
You don't, they measure you. For that one new suit you need for that interview. They're considerate that way.
By measuring the total latent energy that light contains.
By using a water bottle on a sunny day.
What is the Inverse Square Law?
The energy twice as far from the square is spread over 4x the area, hence 1/4 the intensity.
The energy twice as far from the square is spread over 2x the area, hence 1/4 the intensity.
The energy as far from the square is spread over 4x the area, hence 1/8 the intensity.
The energy as far from the square is spread over toast, hence 1/4 the tastiness.
How are Illuminance levels and Illuminance categories used?
To differentiate the differences in the required light for spaces.
To differentiate the amount of light that we get during the night and day.
To help compare the required light for spaces.
To help compare the amount of light that we get during night and day.
What is Color Temperature? How is it measured?
Black body is heated and they measure the color radiance based off of heat.
It is the hue of the color and it is measured with love.
It is the radiance of color and is measured based off of how much heat it attracts.
Color temperature is love with light and measured in hugs.
How does wavelength affect color?
Changes in the wavelength affect how the retina visualizes it.
It doesn't.
The wavelength reflects how much color that we can see in one eye.
When the wavelength ends color becomes invisible.
How is a “candela curve” plotted?
Using data of how light travels from a fixed point in reference to specific angles.
It uses data of radiance and references them in certain angles.
Using data of thermal heat from a fixed point in reference to angles.
It plots itself after data of light is inserted into a data table.
What are the different categories of Reflectance?
Mirror Reflectance
Specular Reflection
Diffuse Reflection
Fluorescence Refection
Absorption Reflection
What is Luminious Transmittance?
It is the ratio of transmitted light to incident light.
It is when light hits a surface and that scatters in multiple directions.
It is when light and glass interact.
It is when light is transmitted to various places during the night.
The Angle of Incidence is the angle in relation to the normal on the surface. On a glazed surface some of the light is transmitted through the surface, while some of it is reflected off.
What is the difference between specular and diffuse reflection?
Specular reflection bounces light off in the same direction and is concentrated in a direction, while diffuse reflection bounces light all around.
Specular reflection is when light hits a surface and then travels faster, while diffuse reflection is when the light will hit a surface and travel slower.
Specular reflection is when the light reflects during the daytime, while diffuse reflection is at nighttime.
Specular reflection is when light does not know where to travel after hitting a surface, while diffuse reflection is light traveling beyond the surface that it hits.
How do material finishes alter the different categories of Reflectance?
The texture of the material can change the angle of reflectance. For example, a rougher finish will cause a diffuse reflectance while a flat surface will cause a specular reflectance.
The texture of material can change the way that the light settles on a surface. For example, a soft finish will invite the light and it will stay for tea, while a hard surface will make the light not want to stay for tea time.
The texture of the material can change the way that light interacts. For example, a shiny surface will result in the reflectance gaining thermal energy, while a dull surface with result in the gain of nuclear energy.
The texture of material can change the angle of altitude. For example, if the light hits above a certain height it will not reflect downwards, but if it hits below a certain height it will only reflect upwards.
