Physics _ Chap 16

An antireflection coating is designed with a thickness of a quarter of the wavelength of light traveling in the film. Does it produce destructive interference?

Yes

When diffraction of light occurs with a single slit,

a number of interference fringes are produced around the central bright spot.

EM waves tend to be scattered the most by an object that is

about the same size as the wave.

A piece of ordinary glass transmits about 92% of the visible light incident on the glass. The transmittance of the glass can be increased by

applying an anti-reflective coating to both sides of the glass.

When ultraviolet light reflects from a violet surface, we see

black.

If a surface is illuminated by magenta light and the red is absorbed, then the color of the surface will appear as

blue.

Prisms and diffraction gratings can both

break the incoming light beam into its constituent colors.

When a beam of light passes through a narrow slit we can observe some light in the "geometrical" shadow of the slit. This light arrived by the process of

diffraction.

The frequency of blue light is ______ that of green light.

greater than

Under the correct conditions, two light waves can produce regions of reinforcement and regions of cancellation. This phenomenon is known as

interference.

The daytime sky is blue, on sunny days, because the atmosphere

is more efficient at scattering blue light.

The leaves of an oak tree are green and those leaves use light to help the tree grow. If the tree were exposed only to green light

it would not grow well because the tree does not use much green light compared to other wavelengths.

Radio waves have ________ wavelength and __________ frequency relative to visible light.

longer; smaller

Electromagnetic waves that travel through a vacuum are not

longitudinal waves.

When you see your shadow on a sunny day, it has a fuzzy edge. This is

not caused by diffraction because the wavelength of visible light is too small to produce visible diffraction around a person.

A common use of a diffraction grating is to

separate light into its separate wavelengths.

Ultraviolet light has ________ wavelength and __________ frequency relative to visible light.

shorter; larger2

The diffraction of light by the pupil of the eye limits

the ability of our eyes to resolve very fine details.

In Young's double-slit experiment, light was first passed through a narrow single slit before going on to the double-slits. The reason for the first slit was

to ensure a constant phase relationship between the interfering light waves.

When you look at a white light through a blue piece of glass, you observe blue light. This means that the blue glass

transmits only the blue light.

A thin layer of oil floats on a water puddle. An observer sees a colored pattern. This happens because

two surfaces each transmit some light and reflect some light.

What primary color must be added to magenta light to produce white light?

Green

Which of the following colors has the shortest wavelength?

Green

Which of the following is not an electromagnetic wave?

Sound

Which of the following waves exhibit interference?

Sound, water, and light

The correct value for the speed of light in air is

3 × 108 m/s.

The normal human eye can detect colors whose wavelengths range from 380 nm to about

700 nm.

If the only light present is yellow, what color will a blue sweater appear to be?

Black

Which statement is true? A. Speed of light in air is lower than in glass B. Radio waves in the AM band are not electromagnetic waves C. Some electromagnetic waves will pass through walls that light cannot penetrate D. In air light travels much faster than radiation from a microwave oven E. Electromagnetic waves can't travel in perfect vacuum

C. Some electromagnetic waves will pass through walls that light cannot penetrate

For visible light, which property of visible electromagnetic waves changes with color?

Frequency and wavelength

An antireflection coating is designed with a thickness of a quarter of the wavelength of light traveling in the film. How many wavelengths farther does the light reflected from the bottom surface of the coating travel than that reflected from the top surface?

One-half wavelength

Which of the following types of radiation diffracts most when it passes through a diffraction grating?

Red

Which two primary colors of light can be added to produce yellow?

Red and green

Light with a wavelength of 450 nm is incident upon a double slit with a separation of 0.3 mm (3×10-4 m). A screen is located 1.5 m from the double slit. At what distance from the center of the screen will the first bright fringe beyond the center fringe appear?

The distance of the first bright fringe from the center of the screen is calculated using the following formula: y=λx/d y=(450×10^-9 m) (1.5 m)/0.3×10^-3 m y=0.225 cm

Light with a wavelength of 630 nm is incident upon a double slit with a separation of 0.3 mm (0.3×10-3 m). A screen is located 1.5 m from the double slit. At what distance from the center of the screen will the fourth dark fringe appear?

The distance of the fourth dark fringe from the center of the screen is calculated using the following formula: y=(m+12)λx/d, where m=3 y=(3+12)(630 nm)×1.5 m/(0.3 mm) y=11.025 mm

An orange fringe produced by double-slit interference lies 1.7 cm from the center of a screen placed 0.8 m from the double slit. If the screen is moved back so that it is now at a distance of 4.4 m from the double slit, how far from the center of the screen will the orange fringe lie?

The distance of the orange fringe from the center of the screen is calculated using the following formula: d2=d1×x2/x1 d2=(4.4 m)×1.7 cm/0.8 m d2=9.35 cm

Violet light of 425 nm is reflected from a thin film of air between two glass plates. The thickness of the film is 1600 nm. How much farther does the light reflected from the bottom surface of the film travel than that reflected from the top surface?

The distance traveled by the light reflected from the bottom surface of the film is calculated as follows: Distance=2×thickness of the film Distance=2×1600 nm Distance=3200 nm

In general, X-rays have wavelengths between 10 nm and 0.01 nm. For an X-ray with a wavelength of 1 nm, what is the corresponding frequency? The speed of light is 3 × 108 m/s.

The frequency of the X-ray is calculated using the following formula: f=c/λ f=(3×10^8 m/s)/1×10^−9 m f=30×10^16 Hz

Violet light of 425 nm is reflected from a thin film of air between two glass plates. The thickness of the film is 1600 nm. How many wavelengths of light does this represent?

The number of wavelengths is calculated as follows: Number of wavelengths=distance traveled by the light reflected from the bottom surface of the film/wavelength of violet light Number of wavelengths=3200 nm/425 nm Number of wavelengths=8

A beam of orange light illuminates two slits that are closely spaced. The resulting intensity pattern is a series of bright and dark fringes. What happens to the intensity pattern if we now change to blue light?

The series of bright and dark fringes gets closer together

What is the wavelength of the radio waves from a station broadcasting at 82.5 MHz? The speed of light is 3 × 108 m/s.

The wavelength of the radio waves is calculated using the following formula: λ=c/f λ=(3×10^8 m/s)/82.5 MHz λ=3.6364 m

Two light waves combine and produce a region of darkness. Which of the following must be true in that region?

The waves were a half-wavelength out of phase