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Light and sound

Science, Grade 4

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Study Guide Light and sound Science, Grade 4

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LIGHT AND SOUND Light! Light is a form of energy that travels in waves. Seeing in Color We can see only the wavelengths and frequencies of the colors in the visible spectrum which include red, orange, yellow, green, blue, and violet. On the visible spectrum, as you move from the colors on the right to the colors on the left, wavelength decreases and frequency increases. Most waves in the electromagnetic spectrum are invisible to our eyes. X rays and waves in your microwave that cook your food are examples of electromagnetic waves. Lesson Checkpoint: How does light travel? Light Behaves in Different Ways A reflection occurs when light rays bounce off a surface back to your eyes, such as when you see your reflection in a mirror. Absorption is when an object takes in light wave. Refraction is when light bends moving from one medium to another. Different Lenses A concave lens is thinner in the middle than on its edges and makes things look smaller. © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
A convex lens is thicker in the middle than on its edges and makes things look larger. A magnifying glass contains a convex lens. Lesson Checkpoint: What are two types of lenses? Materials react to light in different ways: A transparent material allows light to pass through clearly without any effects, like a window. © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
A translucent material allows light to pass through, but it’s not clear, like waxed paper. An opaque material does not allow any light to pass through at all, like a brick wall. Different Kind of Light Lasers are powerful beams of light that create a lot of heat. Optical fibers are extremely thin fibers, made out of glass or plastic, which are bundled together in a flexible tube and have a source of light at the end. Lesson Checkpoint: What is a transparent material? © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
What is that you hear? Sound is a type of energy that travels in waves that is caused by vibrations. Vibrations are movements made rapidly back and forth. Sound needs something in which to travel. Sound can travel through solids, liquids, and gases. Sound travels through solids the fastest. How do we hear? Sound is funneled into our inner ear by our outer ear. The sound then enters our ear canal. The sound causes our ear drum to vibrate. Our ear drum vibrating causes three bones in our middle ear (named stirrup, hammer, and the anvil bone) to vibrate too. The vibrations then move into the cochlea of the inner ear, which is filled with liquid that begins to vibrate causing tiny hairs within it to vibrate as well. The vibrations of the hairs inside the cochlea of the ear send a signal to the brain, which the brain then interprets as SOUND! Lesson Checkpoint: How do you hear sound? © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
Characteristics of Sound: The pitch is the highness or lowness of a sound. Volume is the loudness or quietness of a sound. Frequency is the number of vibrations in a certain amount of time. The faster the vibration, the higher the frequency. A wavelength refers to the distance between a point on one sound wave and a similar point on another sound wave. Is there an echo in here?...Is there an echo in here? An echo occurs when a sound wave bumps into an object and bounces back. An echo is a reflected sound. Lesson Checkpoint: What is a wavelength? © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
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