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Physics Exam 3 > Reading quizzes > Flashcards

Reading quizzes Flashcards

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1
Q

A ray of light passes from one material into a material with a higher index of refraction. What happens to the ray’s angle with the normal? (increase, decrease, or remain unchanged)

A

decrease

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2
Q

A ray of light passes from one material into a material with a higher index of refraction. What happens to the light’s wavelength? (increase, decrease, or remain unchanged)

A

decrease

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3
Q

A ray of light passes from one material into a material with a higher index of refraction. What happens to the light’s frequency? (increase, decrease, or remain unchanged)

A

remain unchanged

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4
Q

A ray of light passes from one material into a material with a higher index of refraction. What happens to the light’s speed? (increase, decrease, or remain unchanged)

A

decrease

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5
Q

A ray of light passes from one material into a material with a higher index of refraction. What happens to the photon’s energy? (increase, decrease, or remain unchanged)

A

remain unchanged

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6
Q

True or false? The angle theta in snell’s law is measured between the ray and a line perpendicular to the surface

A

true

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7
Q

True or false? The speed of light in a material increases as the material’s index of refraction increases.

A

False

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8
Q

the ratio (v/lambda) of a photon’s speed to its wavelength has the same value for any index of refraction (n).

A

True

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9
Q

True or false? photons of blue light have a higher energy than photons of red light.

A

True

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10
Q

True or false? A photon’s energy depends on its brightness.

A

False

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11
Q

Light in medium A undergoes a total internal reflection as it reaches the interface with medim B. Which of the following statements must be true?

A

light traveling in the opposite direction, from B into A, cannot undergo a total internal reflection.

nB < nA

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12
Q

What is true about a beam of white light refracted through any prism in terms of color order?

A

Red will always be ‘on top’ (deviate the least from the original path) while the other colors will be closer and closer to the normal

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13
Q

True or false? For an object at a concave mirror’s center of curvature, the image is real and inverted.

A

True

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14
Q

True or false? As an object approaches the focal point of a concave mirror, the image size shrinks to zero.

A

False

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15
Q

For an object in front of a convex mirror, the image is always virtual and upright. True or false?

A

True

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16
Q

True or false? For any object in front of a diverging lens, the image is virtual and in front of the lens.

A

True

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17
Q

A converging lens always forms a real image and a diverging lens always forms a virtual image. True or false?

A

False

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18
Q

For an object located at the focal point of any lens the image has a magnification equal to one. True or false?

A

False

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19
Q

Suppose you want to use a converging lens to project the image of two trees onto a screen. One tree is a distance x from the lens, while the other is a distance of 2x. You adjust the screen so that the near tree is in focus. If you now want the far tree to be in focus, do you move the screen towards or away from the lens?

A

Towards the lens

20
Q

Light from an object passes through a lens and forms a visible image on a screen. If the screen is removed, would you be able to see the image if you remained in your present position?

A

No

21
Q

Light from an object passes through a lens and forms a visible image on a screen. Would you be able to see the image if you could look at the lens along its axis, beyond the original position of the screen?

A

Yes

22
Q

What do we know about the image created by a flat mirror?

A

It is always virtual and upright

23
Q

In a single-slt diffraction experiment, as the width of the slit is made smaller, what happens to the width of the central maximum of the diffraction pattern?

A

It becomes larger

24
Q

In a two-slit interference pattern projected on a screen, the fringes are equally spaced where?

A

only for small angles

25
Q

Suppose young’s experiment is carried out in air, then, underwater. In what way does the distance between bright fringes change?

A

They move closer together

26
Q

If laser light is reflected from a phonograph record or a compact disc, a diffraction pattern appears. The pattern arises because both devices contain parallel tracks of information that act as a reflection grating. Which device, record or CD, results in diffraction maxima that are farther apart?

A

the CD

27
Q

Young’s double slit experiment is performed with three different colors of light, R, G, and B. Rank the colors by the distance between adjacent bright fringes, from smallest to largest.

A

Blue, green, red ym=(lambdaL/d)m

28
Q

If the distance between the slits is doubled in young’s experiment, what happens to the width of the central maximum?

A

The width is halved

29
Q

A plane monochromatic light wave is incident on a double-slit as illustrated in the figure below. If the viewing screen is moved away from the double slit, what happens to the separation between the interference fringes on the screen?

A

it increases

30
Q

A plane monochromatic light wave is incident on a double-slit as illustrated in the figure below. As the slit separation decreases, what happens to the separation between the interference fringes on the screen?

A

it increases

31
Q

If young’s double slit experiment carried out in air is repeated under water, would the distance between the bright fringes increase, decrease, or remain the same?

A

decrease ym=(lambdaL/d)m

32
Q

Sodium’s emission lines at 589.0nm and 589.6 nm pass through a diffraction grating and form two m= +1 maxima on a viewing screen. Would the spacing between the lines increase, decrease or remain unchanged if the grating is exchanged for one having fewer lines per millimeter?

A

the spacing decreases

33
Q

Sodium’s emission lines at 589.0nm and 589.6 nm pass through a diffraction grating and form two m= +1 maxima on a viewing screen. Would the spacing between the lines increase, decrease or remain unchanged if the grating is exchanged for one with twice the total number of lines (the number of lines per millimeter is the same)

A

the spacing remains unchanged

34
Q

Sodium’s emission lines at 589.0nm and 589.6 nm pass through a diffraction grating and form two m= +1 maxima on a viewing screen. Would the spacing between the lines increase, decrease or remain unchanged if the intensity of the light is doubled

A

the spacing remains unchanged

35
Q

Sodium’s emission lines at 589.0nm and 589.6 nm pass through a diffraction grating and form two m= +1 maxima on a viewing screen. Would the spacing between the lines increase, decrease or remain unchanged if the maxima are viewed in second order?

A

The spacing increases

36
Q

What is required for a 180 phase reversal?

A

for the light to be reflected off of a surface with a higher index of refraction than the medium the light is in. (n1<n2)

37
Q

A CCD camera is equipped with a lens with constant focal-length. as the f-number is decreased, determine if the aperture increases, decreases or remains the same.

A

increases (note that the f number is f/D, D is the diameter of the lens)

38
Q

A CCD camera is equipped with a lens with constant focal-length. as the f-number is decreased, determine if the depth of field increases, decreases or remains unchanged

A

decreases

39
Q

A CCD camera is equipped with a lens with constant focal-length. as the f-number is decreased, determine if the intensity of the light reaching the sensor increases, decreases or remains unchanged

A

increases

40
Q

A CCD camera is equipped with a lens with constant focal-length. as the f-number is decreased, determine if the appropriate exposure time increases, decreases, or remains unchanged

A

decreases (as the aperture decreases, the exposure time goes down to prevent the image from becoming overexposed)

41
Q

for a nearsighted person, the _____ is always located closer than ______ from the eye and the corrective lens is _____

A

far point, infinity, diverging

42
Q

for a farsighted person, the _____ is always located farther than ______ from the eye and the corrective lens is _____

A

near point, 25 cm, converging

43
Q

A patient has a near point of 1.25m. Is she near or farsighted? What should the corrective lens be?

A

she is farsighted and needs a converging lens

44
Q

suppose a microscope’s resolution is diffraction limited. which one of the following changes would provide the greatest improvement to its resolution?

A

observing at a shorter wavelength through a larger aperture

thetamin = 1.22lambda/D (diameter)

want theta minumum to be the LEAST

45
Q

if you increase the aperture diameter of a camera by a factor of three, how is the intensity of the light striking the film affected?

A

it increases by a factor of 9 (I = D^2/f^2)

Physics Exam 3 (2 decks)

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