Chapter 28 And 33 Quiz

In the demonstration portion of the video, you were asked to think about the image of a candle formed by a concave mirror. Suppose that the lower half of the mirror were covered with black tape. How would that affect the image?

(Figure 1) shows a candle placed on the principal axis of a spherical concave mirror with the focal point F. One ray of light is shown leaving the center of the candle flame and reflecting off the mirror. This can be treated as _____________.

What type or types of image can be displayed on a screen (for example, on a blank sheet of white paper)?

Which of the following is a true statement about virtual images?

If an object is placed a great distance away from and in front of a converging lens such as the one shown in the video, where will its image be formed?

Which of the following positions of an object will create a real image if the lens is a converging lens as shown in the video?

The blackness of the type on a page is due to _________.

Light travels a path from one location to another in the least _________.

Specular reflection is common in the light reflected from _________.

A mirage is the result of atmospheric _________.

Which of the following changes when light is refracted?

Dispersion of light from drops making up a rainbow have undergone refraction and internal _________.

A secondary rainbow in the sky is the result of a _________.

Total internal reflection occurs when the speed of light in a material is _________.

A feature of a pinhole camera is that the image _________.

A magnifying glass widens the angle through which _________.

The discovery of radioactivity closely followed the discovery of _________.

Which of these is electromagnetic radiation?

Which of these comprises the least radiation in the everyday environment?

Which of these ejects into the atmosphere the greatest amount of dangerous radiation?

The strong force is one of the four fundamental forces in nature, and exists _________.

If a certain isotope has a radioactive half-life of 10 years, how much of the isotope will remain at the end of 20 years?

Which of these radiation detectors converts flashes of light into electric signals?

An element that undergoes radioactive decay becomes _________.

Carbon-14 in the atmosphere is transformed from _________.

All the uranium in today's deposits in the future will become _________.

How does incident light that falls on an object affect the motion of electrons in the atoms of the object?

What do the electrons affected by illumination do when they are made to vibrate with greater energy?

What is Fermat's principle of least time?

Cite the law of reflection.

Relative to the distance of an object in front of a plane mirror, how far behind the mirror is the image?

What fraction of the light shining straight at a piece of clear glass is reflected from the first surface?

Can a surface be considered polished for some waves and not for others? Cite an example.

What is astigmatism, and how can it be corrected?

How does the angle at which a ray of light strikes a pane of window glass compare with the angle at which it passes out the other side?

When is the angle at which a ray of light strikes glass not the same as the angle it exits?

In which medium does light travel faster - thin air or dense air? How does this affect the length of daylight hours?

Does the law of reflection hold for curved mirrors? Explain.

Is a mirage the result of reflection or refraction? Why does it happen?

When the wheel of a cart rolls from a smooth sidewalk onto a plot of grass, the interaction of the wheel with the blades of grass slows the wheel. What slows light when it passes from air into glass or water?

What is the angle between a light ray and its wavefront?

What is the relationship between index of refraction and the speed of light in a material?

Are eyeglasses made with "high index of refraction" materials thinner or thicker? Why?

How does refraction change the apparent depth of a swimming pool?

Which travels more slowly in glass, red light or violet light? Why?

Does a single raindrop illuminated by sunlight deflect light of a single color or does it disperse a spectrum of colors? Does it do this by reflection, refraction, or both?

Does a viewer see a single color or a spectrum of colors coming from a single faraway drop?

Why is a secondary rainbow dimmer than a primary bow? How are the colors arranged in the secondary bow?

What is meant by critical angle?

At what angle inside glass is light totally internally reflected? At what angle inside a diamond is light totally internally reflected?

Light normally travels in straight lines, but it "bends" in an optical fiber. Explain.

Distinguish between a converging lens and a diverging lens.

What is the focal length of a lens? What is the focal point?

Distinguish between a virtual image and a real image. Mention in each case whether the image made by a single lens is right-side up or inverted.

What kind of lens can be used to produce a real image? A virtual image?

Why is vision sharpest when the pupils of the eye are very small?

When a flashlight submerged in water shines up into the air above, does the speed of light increase or decrease when the light passes from water into the air?

In the multiple images of physics teacher Karen Jo Matsler in (Figure 1), how many mirrors are involved?

Her eye at point P looks into the mirror. Which of the numbered cards can she see reflected in the mirror? (Figure 1)

If a nearsighted person wants thinner eyeglasses, is a higher or a lower index of refraction for the lenses recommended?

Waves don't overlap in the image of a pinhole camera. Does this feature contribute to sharpness or to a blurry image?

She looks at her face in the handheld mirror.Rank the amount of her face she sees in the three locations, from greatest to least. Or is it the same in all positions?

Wheels from a toy cart are rolled from a concrete sidewalk onto the following surfaces: A, a paved driveway; B, a grass lawn; C, close-cropped grass on a golf-course putting green. Due to slowing, each set of wheels bends at the boundary and is deflected from its initial straight-line course.Rank the surfaces according to the amount each set of wheels bends at the boundary, from greatest amount of bending to least.

Identical rays of light in air are refracted upon entering three transparent materials: A, water, where the speed of light is 0.75c; B, ethyl alcohol (speed 0.7c); C, crown glass(speed 0.6c). (Figure 1) Rank the materials according to how much the light ray bends toward the normal, from most bending to least bending.

A butterfly at eye level is 16 cm in front of a plane mirror. You are behind the butterfly, 50 cm from the mirror.What is the distance between your eye and the image of the butterfly in the mirror?

When light strikes glass perpendicularly, about 4.8 % is reflected at each surface Find what percent of light is transmitted through a pane of window glass.

No glass is perfectly transparent. Mainly because of reflections, about 92 % of light passes through an average sheet of clear windowpane. The 8 % loss is not noticed through a single sheet, but through several sheets, the loss is apparent. How much light is transmitted by a double-paned window (one with two sheets of glass)?

The diameter of the Sun makes an angle of 0.53∘ from Earth.How many minutes does it take the Sun to move 1 solar diameter in an overhead sky? (Remember that it takes 24 hours, or 1440 minutes, for the Sun to move through 360∘).How does your answer compare with the time it takes the Sun to disappear, once its lower edge meets the horizon at sunset? Does refraction affect your answer?

What did Wilhelm Roentgen discover about a cathode-ray beam striking a glass surface?

What kind of rays are X-rays?

What did Henri Becquerel discover about uranium?

What two elements did Pierre and Marie Curie discover?

Why aren't gamma rays deflected in a magnetic field?

Which has the higher frequency: X-rays or gamma rays?

Distinguish between a rad and a rem.

Do humans receive more radiation from artificial or natural sources of radiation? What fraction comes from this source?

Is the human body radioactive? Explain.

What is a radioactive tracer?

Name the two different nucleons.

Why doesn't the repulsive electrical force of protons in the atomic nucleus cause the protons to fly apart?

Why is a larger nucleus generally less stable than a smaller nucleus?

What is the role of neutrons in the atomic nucleus?

Which contains the higher percentage of neutrons: large nuclei or small nuclei?

How does the rate of decay of a long-half-life material normally compare to the rate of decay of a short-half-life material?

What is the half-life of Ra-226?

What kind of trail is left when an energetic particle shoots through matter?

Which type of detector senses radiation by the ionization of gas in a tube?

Which type of detector senses flashes of light produced by charged particles or gamma rays?

What is transmutation? Give one example.

When thorium (atomic number 90) decays by emitting an alpha particle, what is the atomic number of the resulting nucleus?When thorium decays by emitting a beta particle, what is the atomic number of the resulting nucleus?

What is the change in the atomic mass number for each of the reactions in the preceding two questions?

What change in atomic number occurs when a nucleus emits an alpha particle? A beta particle? A gamma ray

What is the long-range fate of all the uranium that exists in the world?

When, and by whom, did the first successful intentional transmutation of an element occur?

What occurs when a nitrogen nucleus captures an extra neutron?

Which is more prevalent in the food we eat: carbon-12 or carbon-14?

Why is lead found in all deposits of uranium ore?

X-rays are most similar to which of the following - alpha, beta, or gamma rays?

Which type of radiation - alpha, beta, or gamma - predominates within an enclosed elevator descending into a uranium mine?

Rank these three types of radiation by their ability to penetrate a page of a book, from greatest penetration to least. A. Alpha particle. B. Beta particle. C. Gamma ray.