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Physics > Light > Flashcards

Light Flashcards

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1
Q

All electromagnetic waves travel at the same speed in a vacuum, which is the speed of light.

A

true

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2
Q

Given the wave speed equation,

what is the relationship between frequency () and wavelength ()?

A

inverse

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3
Q

Refer to the table. Which color shown has the longest wavelength?

A

red

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4
Q

The frequency of electromagnetic radiation is measured in ________.

A

hertz

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5
Q

Which statement about electromagnetic radiation is False?

A

Visible light falls between gamma and X-rays on the electromagnetic spectrum

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6
Q

Which of the following is approximately equal to the currently accepted value for the speed of light?

A

3E8 m/s

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7
Q

In a vacuum, electromagnetic radiation of short wavelengths

A

travels as fast as radiation of long wavelengths

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8
Q

How does light travel?

A

All of the above

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9
Q

When a wave strikes an object and bounces off, ____________ occurs.

A

reflection

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10
Q

Waves that strike an object are called __________ waves or rays.

A

incident

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11
Q

According to the law of reflection, the angle of incidence is _____ the angle of reflection.

A

equal to

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12
Q

If a light ray hits a plane mirror at 46º. What is the angle of reflection?

A

46

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13
Q

What type of light reflection occurs when light is reflected from a rough, textured surface?

A

diffuse

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14
Q

A mirage is the result of

A

all of the above

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15
Q

Even when the sun has passed just below the horizon, we can still see the sun for a few more minutes because the sun’s light rays are _____ by the atmosphere.

A

refracted

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16
Q

A student puts a hand up in front of a plane mirror as shown. Four possible observations are shown in the table. Which observation in the table correctly describes the image of the hand?

A

student 4

17
Q

Various wavelengths of incoming light are bent at different angles when they encounter a refracting medium. What is the name of this phenomenon?

A

dispersion

18
Q

When white light passes through a prism, what color is bent most?

A

violet

19
Q

When red light and blue light shine on the same place on a piece of white paper, the spot appears to be

A

magenta

20
Q

When red light and green light shine on the same place on a piece of white paper, the spot appears to be

A

yellow

21
Q

When blue light and yellow light shine on the same place on a piece of white paper, the spot appears to be

A

white

22
Q

What is the function of a spectrometer?

A

to separate light from a source into its monochromatic components

23
Q

When the light given off (emitted) by an atomic gas is passed through a prism, a series of distinct bright lines is seen. Each line corresponds to a different wavelength, or color, of light. Such a series of spectral lines is commonly referred to as a(n) _________________.

A

emission spectrum

24
Q

Which elements are present in the mixture of unknown gases?

A

hydrogen and helium

25
Q

Which elements are NOT present in the mixture of unknown gases?

A

lithium and sodium

26
Q

When viewed from Earth, the light from very distant galaxies shows a red shift. This is evidence that these distant galaxies are -

A

moving away from earth

27
Q

which diagram best represents the spectral lines of this element when its light is observed coming from a star that is moving away from earth?

A

d (the spectral lines are redshifted)

28
Q

What is the best inference that can be made concerning the movement of galaxies A, B, and C?

A

d (galaxies A, B, and C are all moving away from earth)

29
Q

the number of electrons being emitted from the surface depends on ——— of the light

A

intensity

30
Q

the kinetic energy of electrons being emitted depends on the ——of light

A

frequency

31
Q

the results of hertz’s examination of the photoelectric effect —— be explained by the classical theory of physics consisting of newtonian mechanics and maxwellian electromagnetism

A

cannot

32
Q

einstein hypothesized that electromagnetic radiation can behave like

A

both a wave and a particle

33
Q

what term refers to electromagnetic waves as particles

A

photons

34
Q

the results of hertz’s examination of the photoelectric effect ——- be explained by einsteins photon theory which built upon plancks quantum theory

A

can

35
Q

a quantum of energy is the minimum quantity of energy that can be lost or gained by an atom

A

true

36
Q

the photoelectric effect helped prove that ligh

A

comes in packets called photons

37
Q

the —— of a photon is zero

A

mass

38
Q

in his ——- heisenberg argued that it is fundamentally impossible to make simultaneous measurements…

A

uncertainty principle

39
Q

which of the following devices typically use the photoelectric effect to function?

A

solar panels, garage door opener, tv remote control

Physics (9 decks)

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