All flashcards
Flashcard 1: What is the rule about seeing most objects: do your eyes need light from the object?
Answer: You see most objects only when light from them reaches your eyes. Light must travel from objects to your eyes for vision to occur.
Flashcard 2: Choose the correct claim: To see an object, light must travel from a light source to the object and then to what?
Answer: To your eyes. Light follows this path: source → object → eyes for vision.
Flashcard 3: Which option best describes what happens when light shines on a non-light source object?
Answer: The object reflects light into your eyes. Non-light sources become visible by bouncing light to your eyes.
Flashcard 4: Choose the correct conclusion: If you can see a flashlight in the dark, what does that show?
Answer: The flashlight is a light source when it is on. Seeing it in darkness proves it produces its own light when on.
Flashcard 5: Which option is correct: a book is seen mainly by light it makes or by light it reflects?
Answer: By light it reflects. Books don't produce light; they reflect light from other sources.
Flashcard 6: Which option is correct: the Moon is seen mainly by light it makes or by light it reflects?
Answer: By light it reflects. The Moon shines by reflecting sunlight, not producing its own light.
Flashcard 7: Which option is correct: a lit candle is seen mainly by light it makes or by light it reflects?
Answer: By light it makes. Candles produce their own light through combustion.
Flashcard 8: What is the word for an object that makes its own light, such as the Sun or a lit bulb?
Answer: Light source. Objects that produce their own light, like stars or lamps.
Flashcard 9: Choose the correct conclusion: If you can see a cat only when sunlight enters, what does it show?
Answer: The cat needs light to be seen (it reflects light). The cat is visible only when light is present to reflect off it.
Flashcard 10: What is the word for the dark shape seen when an object blocks light from reaching a surface?
Answer: Shadow. Created when objects block light from reaching a surface.
Flashcard 11: What is the word for an object that does not make light but can be seen when light shines on it?
Answer: Non-light source (object seen by reflected light). These objects are visible only when light bounces off them.
Flashcard 12: What is the meaning of the word "shadow" in a light-and-objects investigation?
Answer: A dark area where light is blocked by an object. Shadows form when opaque objects block light.
Flashcard 13: What is the main reason most objects can be seen by your eyes?
Answer: Light reflects off the object and enters your eyes. Objects don't produce light; they must reflect it to be visible.
Flashcard 14: What is the meaning of the word "reflect" when talking about light and objects?
Answer: To bounce light off a surface. Light bounces back when it hits a surface.
Flashcard 15: What is a light source?
Answer: An object that makes its own light. Examples include the Sun, fire, and light bulbs.
Flashcard 16: Which option best describes why a book is visible in a lit room: emits light or reflects light?
Answer: Reflects light. Books don't produce their own light.
Flashcard 17: Which option is a light source: the Sun or the Moon?
Answer: The Sun. The Sun produces light; the Moon only reflects it.
Flashcard 18: What is the best evidence that the Moon is not a light source?
Answer: It is bright because it reflects sunlight. The Moon shines by reflecting the Sun's light, not producing its own.
Flashcard 19: Identify the condition needed to see a non-glowing object such as a chair.
Answer: Light must shine on it so light can reflect to your eyes. Without light to reflect, objects remain invisible.
Flashcard 20: Which option best explains why a chair is hard to see in a dark room: no light to reflect or too much light?
Answer: No light to reflect. In darkness, there's no light for objects to reflect.
Flashcard 21: What is the meaning of the word "transparent" for a material such as clear glass?
Answer: Light passes through it easily. You can see clearly through transparent materials.
Flashcard 22: What is the meaning of the word "translucent" for a material such as wax paper?
Answer: Some light passes through, but it is scattered. Light passes through but gets mixed up, making things look blurry.
Flashcard 23: What is the meaning of the word "opaque" for a material such as cardboard?
Answer: Light does not pass through it. Opaque materials block all light from passing through.
Flashcard 24: Which material lets light pass through best: clear plastic wrap or a wooden board?
Answer: Clear plastic wrap. Transparent materials allow light to pass through clearly.
Flashcard 25: Identify the best evidence that a lamp helps you see a table in a room.
Answer: When the lamp is on, the table becomes easier to see. The lamp provides light that reflects off the table to your eyes.
Flashcard 26: Which option is visible in complete darkness: a turned-on flashlight or an unlit toy?
Answer: A turned-on flashlight. Light sources are visible in darkness; other objects need light to reflect.
Flashcard 27: What is one clear sign that an object does not need outside light to be seen?
Answer: It glows because it makes its own light. Light sources produce their own light and don't need reflection.
Flashcard 28: Which option is the best conclusion: You can see objects without light or you need light to see most objects?
Answer: You need light to see most objects. Most objects require light to reflect for visibility.
Flashcard 29: Identify the best evidence that light travels from a flashlight to a wall.
Answer: A bright spot appears on the wall when the flashlight is on. The light travels from source to wall, creating a visible spot.
Flashcard 30: Which type of object makes the darkest shadow: transparent, translucent, or opaque?
Answer: Opaque. Opaque objects block all light, creating dark shadows.