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Physics > Unit C: Electromagnetic Radiation > Flashcards

Unit C: Electromagnetic Radiation Flashcards

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1
Q

Is a concave lenses focal length positive or negative?

A

Negative

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2
Q

Is a concave mirrors focal length positive or negative?

A

Positive

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3
Q

Is a convex lenses focal length positive or negative?

A

Positive

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4
Q

Is a convex mirrors focal point positive or negative?

A

Negative

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5
Q

What is the order of the electromagnetic spectrum, largest wavelength to shortest?

A

Radio->Micro->Infrared->Visible->UV->Xray->Gamma

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6
Q

What wavelength range, in nanometers, does visible light occur?

A

400nm(purple) to 700nm(red)

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7
Q

Distances that are virtual (objects, images, or focal lengths) are positive or negative numbers?

A

Negative numbers

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8
Q

Erect images and objects have a ________ height.

A

Positive

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9
Q

________ images have a negative height.

A

Inverted

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10
Q

________ magnification means the image is erect, while _______ magnification means the image is _______.

A

Positive, negative, inverted.

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11
Q

A wave has a speed of 5.0 x 10-1 m/s and a wavelength of 2.0m. What is it’s period?

A

4 seconds

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12
Q

At what speed does all EMR travel at?

A

3.00 x 108 m/s (The speed of light)

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13
Q

A water wave has a wavelength of 5.0m and a speed of 2.5 m/s. What is the period of this wave?

A

2 seconds

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14
Q

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?

A

300m

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15
Q

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?

A

5.3 x 10-1 m/s

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16
Q

The Law of Reflection states the angle of ________ equals the angle of reflection.

A

Incidence

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17
Q

Size of image compared to size of object:

A

Magnification

18
Q

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

A

49 degrees

19
Q

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.

A

49 degrees

20
Q

r/2, or half the radius of the curvature, equals the:

A

Focal Length (f)

21
Q

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.

A

7.5 cm behind the mirror

22
Q

Converging lenses are ______ in shape,
Diverging lenses are _______ in shape.

A

Convex, concave

23
Q

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.

A

Real, inverted, larger

24
Q

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.

A

Constructive, destructive

25
Q

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.

A
26
Q

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.

A
27
Q

List the seven colours of the visible light spectrum from high energy to low energy.

A

Violet, indigo, blue, green, yellow, orange, red.

28
Q

Calculate the period of the wave for a blue laser diode having a frequency of 4.23 x 1014 Hz.

A
29
Q

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

A

d. microwave, infared, visible, X ray

30
Q

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

A

c. Blue

31
Q

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.

A

t=d/v
260 seconds

32
Q

Electromagnetic radiation that has a wavelength of 260 m is classified as:
a. Infrered
b. Gamma
c. Visible
d. Radio

A

d. Radio

33
Q

What is the index of refraction?

A

The ratio of the speed of light in a vacuum and the speed of light in a specific medium/substance.
n=c/v

34
Q

In a medium where the speed of light is 2.00 x 108 m/s the index of refraction is:

A

n=c/v
n=1.50

35
Q

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

A

b.the light is passing from a low to a high speed medium

36
Q

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.

A

38 degrees

37
Q

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.

A

61.7 degrees

38
Q

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
39
Q

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.

A
Note: Focal point is r/2 and positive (converging mirror).
40
Q

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.

A
41
Q

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.

A

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