Light

Question 1

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

Answer 1

true

Question 2

Given the wave speed equation,

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

Answer 2

inverse

Question 3

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

Answer 3

red

Question 4

The frequency of electromagnetic radiation is measured in ________.

Answer 4

hertz

Question 5

Which statement about electromagnetic radiation is False?

Answer 5

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

Question 6

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

Answer 6

3E8 m/s

Question 7

In a vacuum, electromagnetic radiation of short wavelengths

Answer 7

travels as fast as radiation of long wavelengths

Question 8

How does light travel?

Answer 8

All of the above

Question 9

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

Answer 9

reflection

Question 10

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

Answer 10

incident

Question 11

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

Answer 11

equal to

Question 12

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

Answer 12

46

Question 13

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

Answer 13

diffuse

Question 14

A mirage is the result of

Answer 14

all of the above

Question 15

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.

Answer 15

refracted

Question 16

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?

Answer 16

student 4

Question 17

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

Answer 17

dispersion

Question 18

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

Answer 18

violet

Question 19

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

Answer 19

magenta

Question 20

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

Answer 20

yellow

Question 21

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

Answer 21

white

Question 22

What is the function of a spectrometer?

Answer 22

to separate light from a source into its monochromatic components

Question 23

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) _________________.

Answer 23

emission spectrum

Question 24

Which elements are present in the mixture of unknown gases?

Answer 24

hydrogen and helium

Question 25

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

Answer 25

lithium and sodium

Question 26

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

Answer 26

moving away from earth

Question 27

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?

Answer 27

d (the spectral lines are redshifted)

Question 28

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

Answer 28

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

Question 29

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

Answer 29

intensity

Question 30

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

Answer 30

frequency

Question 31

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

Answer 31

cannot

Question 32

einstein hypothesized that electromagnetic radiation can behave like

Answer 32

both a wave and a particle

Question 33

what term refers to electromagnetic waves as particles

Answer 33

photons

Question 34

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

Answer 34

can

Question 35

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

Answer 35

true

Question 36

the photoelectric effect helped prove that ligh

Answer 36

comes in packets called photons

Question 37

the —— of a photon is zero

Answer 37

mass

Question 38

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

Answer 38

uncertainty principle

Question 39

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

Answer 39

solar panels, garage door opener, tv remote control