We can see an adorable puppy because it reflects light. Is this reflection regular or diffuse?
diffuse
100
What do we call the powder inside a florescent bulb?
phosphor
100
Shining blue light on metal ejects electrons because of what effect?
the photoelectric effect
100
If you shine only ultraviolet light on an object that looks cyan under sunlight, what color will the object appear to you?
black (because we can't see UV light, whether or not the object reflects it)
100
You can’t build a white laser because the light coming out of a laser is always this, and this type of light can’t be a combination of the different wavelengths needed to add up to white light.
coherent
200
How will a white object look if you shine red light on it?
it will look red
200
What is the wavelength of a 107.5 MHz radio wave?
v = λf
300,000,000 m/s = λ(107.5 x 1,000,000 Hz)
λ = 2.79 m
200
What type of waves have wavelengths longer than a meter?
radio waves
200
What color will an object that appears yellow under sunlight appear when you shine magenta light on it?
Yellow light coming in, made of red and green
Magenta reflects magenta (red and blue) and absorbs green
So the object will look red
(R + G - G = R)
200
What are 3 types of light bulbs typically found in an American home.
florescent, incandescent, tungsten-halogen, LED
300
When all colors of visible light are combined, what color will the resulting spot be?
white
300
Who experimented with the photoelectric effect to show that light sometimes behaves like a particle?
Einstein
300
Which color of visible light refracts the most and which the least?
violet and blue refract the most; red refracts the least
300
If a filter makes white light look green, what primary colors of light does it absorb?
red and blue
300
What is the SI unit of power?
the watt (W)
400
When considering pigments, if you combine blue and yellow, or red and cyan, or green and magenta, what color pigment results?
combining any two complementary colors of pigment results in black pigment
400
By shining coherent light through a double slit and observing the interference pattern, Young showed that light sometimes behaves like what?
a wave
400
If you shine green light on an object that appears cyan in sunlight, what color will it now appear to be?
Green light coming in; cyan reflects cyan (blue and green) and absorbs red
The green light isn't being absorbed
So the object looks green
(G - R = G)
400
What would happen if an incandescent bulb were full of air?
It would burn out very quickly (because the hot filament would react with the oxygen in the air)
400
What is the SI unit of velocity?
m/s
500
We learned about two different types of light bulbs that make light by heating a tungsten filament up so much that it glows. What are these two types of bulbs?
incandescent bulbs and tungsten-halogen bulbs
500
Hershel showed that the electromagnetic spectrum consists of more than just visible light by measuring the temperature just past the red part of a rainbow from a prism. What do we call this invisible part of the spectrum just beyond red?
infrared
500
What color pigment can you mix with yellow pigment so that the resulting pigment will absorb all wavelengths of visible light?
blue (because blue and yellow are complementary colors)
500
What type of light do fluorescent bulbs emit BEFORE that light hits the phosphor powder coating the inside of the glass tube?
UV light (the UV light needs to hit the phosphor to be reemitted as visible light)