Unit C: Electromagnetic Radiation Flashcards
Is a concave lenses focal length positive or negative?
Negative
Is a concave mirrors focal length positive or negative?
Positive
Is a convex lenses focal length positive or negative?
Positive
Is a convex mirrors focal point positive or negative?
Negative
What is the order of the electromagnetic spectrum, largest wavelength to shortest?
Radio->Micro->Infrared->Visible->UV->Xray->Gamma
What wavelength range, in nanometers, does visible light occur?
400nm(purple) to 700nm(red)
Distances that are virtual (objects, images, or focal lengths) are positive or negative numbers?
Negative numbers
Erect images and objects have a ________ height.
Positive
________ images have a negative height.
Inverted
________ magnification means the image is erect, while _______ magnification means the image is _______.
Positive, negative, inverted.
A wave has a speed of 5.0 x 10-1 m/s and a wavelength of 2.0m. What is it’s period?
4 seconds
At what speed does all EMR travel at?
3.00 x 108 m/s (The speed of light)
A water wave has a wavelength of 5.0m and a speed of 2.5 m/s. What is the period of this wave?
2 seconds
A radio station broadcasts at a frequency of 1.00 x 106 Hz. If the speed of this wave is 3.00 x 108 m/s, what is it’s wavelength?
300m
While floating on your air mattress on a river, you bob up and down 40 times in 5.0 min and you estimate the distance between the crests is 4.0m. What is the estimated speed of the waves?
5.3 x 10-1 m/s
The Law of Reflection states the angle of ________ equals the angle of reflection.
Incidence
Size of image compared to size of object:
Magnification
A beam of light travelling in glycerin hits the boundary between itself and water at an angle of 43° from the normal. Determine the angle of refraction through the water.
Refracive index of water: 1.33
Refractive index of glycerin: 1.47
49 degrees
What is the critical angle between an air
(n=1.00)-water (n= 1.33) interface?
Note: We must go from more dense to less
dense.
49 degrees
r/2, or half the radius of the curvature, equals the:
Focal Length (f)
A diverging mirror has a radius of 20cm. An object is placed 30 cm in front of the mirror. Determine where the image will appear.
7.5 cm behind the mirror
Converging lenses are ______ in shape,
Diverging lenses are _______ in shape.
Convex, concave
A converging lens has a focal length of 0.22 m. If an object is placed 0.41 m in front of the lens, determine where the image will appear and identify its characteristics.
Real, inverted, larger
In a wave:
Where crest meets crest, there is ___________ interference and a bright spot appears.
Where crest meets trough, there is ___________ interference and a black spot appears.
Constructive, destructive
A pair of screens are placed 13.7m apart. A third order fringe is seen on the screen 2.50cm from the central fringe. If the slits were cut 0.0960 cm apart, determine the wavelength and colour of this light.
If a yellow light with a wavelength of 540 nm shines on a double slit with the slits cut 0.0100mm apart, determine what angle you should look away from the central fringe to see the second order fringe.
List the seven colours of the visible light spectrum from high energy to low energy.
Violet, indigo, blue, green, yellow, orange, red.
Calculate the period of the wave for a blue laser diode having a frequency of 4.23 x 1014 Hz.
Electromagnetic radiation, listed in order of increasing energy, is:
a. radio wave, X ray, microwave, infared
b. AC, radio wave, visible, infared
c. microwave, visible, infared, UV
d. microwave, infared, visible, X ray
d. microwave, infared, visible, X ray
A pen laser has a wavelength of 460nm. The location in the spectrum of the laser beam produced by this pen laser is most likely:
a. Red
b. Orange
c. Blue
d. UV
c. Blue
Determine the time required for a radio signal to reach Earth if it was sent from Mars from a distance of 7.80 x 1010 m when it is closest to the Earth.
t=d/v
260 seconds
Electromagnetic radiation that has a wavelength of 260 m is classified as:
a. Infrered
b. Gamma
c. Visible
d. Radio
d. Radio
What is the index of refraction?
The ratio of the speed of light in a vacuum and the speed of light in a specific medium/substance.
n=c/v
In a medium where the speed of light is 2.00 x 108 m/s the index of refraction is:
n=c/v
n=1.50
A critical angle may be calculated only if:
a. the light is passing from a high to a low speed medium
b.the light is passing from a low to a high speed medium
c. the incident ray is not reflected
d. the resulting angle of refraction is known
b.the light is passing from a low to a high speed medium
A ray of light from air strikes the surface of a block of glass, having a refractive index of 1.50, at an angle of 67 degrees. Determine the angle of refraction.
38 degrees
Lucite is a strong clear plastic used for many windows. Determine the critical angle for a water Lucite system. The refractive index of water is 1.33 and 1.51 for Lucite.
61.7 degrees
A Michelson type experiment was done to measure the speed of light in a substance. The eight sided mirror and the reflecting mirror were placed at opposite ends of an 18.0 km pipe of beer. The minimum frequency of rotation required to make a successful reading was found to be 990 Hz. What is the speed of light in the substance?
A 3.0 cam tall object is placed 15 cam in front of a concave (converging) mirror which has a radius of 20 cm. What is the image distance? What is the size of the image? Describe the image characteristics.
An 8.0 cm high object is placed 18 cm from a convex (diverging) mirror having a focal length of 10 cm. Where is the image? What is the size of the image? Describe the image characteristics.
An object 3.0 cm high is 15 cm from a convex (converging) lens of 6.0 cm focal length. What is the distance to the image and the height of the image? Describe the image characteristics.
