Sound & Light

Science, Grade 5

Characteristics of Light 2:13 1 2 3 4 5 6 7 8 9 0 Visible Light Sound & Light © Copyright NewPath Learning. All Rights Reserved. 94-4510 Decibels of Sound a whisper 10 normal conversation 60 train horn 100 rock concert 140 jet plane 120 What is Light? Like sound, light is a form of energy that travels in waves. Unlike sound, light is not caused by the vibration of particles, but it is a form of electromagnetic radiation (a combination of electrical and magnetic energy). Electromagnetic Spectrum Light, or electromagnetic radiation, comes in many forms. There are radio waves, microwaves, infrared light, visible light, ultraviolet light, X-rays and gamma rays, all of which form what is known as the electromagnetic spectrum. Most waves in the electromagnetic spectrum are invisible to our eyes. What is Sound? Sound is a type of energy that travels in waves caused by vibrations. Vibrations are movements made rapidly back and forth. Characteristics of Sound The loudness or quietness of a sound is its volume. The loudness of a sound can be measured in units called decibels. Pitch is the highness or lowness of a sound. We can only see the wavelengths and frequencies of the colors in the visible spectrum which include red, orange, yellow, green, blue, and violet. Wave Characteristics Sound waves are an invisible transfer of sound energy as it travels away from the energy source. A wavelength refers to the distance between a point on one sound wave and a similar point on another sound wave. The number of vibrations in a period of time is called the frequency of a vibration. Frequency is measured in Hertz (Hz); the faster the vibration, the higher the frequency. frequency wavelength crest trough How does sound travel? Sound needs something in which to travel. Sound can travel through solids, liquids, and gases. Sound travels through solids the fastest. Reflection is the bouncing of light off a surface. Absorption occurs when a material absorbs or takes in light. Refraction is the bending of light as it moves from one material to another. radio waves microwaves X-rays ultraviolet gamma rays
Characteristics of Light 2:13 1 2 3 4 5 6 7 8 9 0 Visible Light Sound & Light © Copyright N ewPath Learning. All Rights Reserved. 94-4510 What is Light? What is light? _______________________________________ ___________________________________________________ Electromagnetic Spectrum What is the electromagnetic spectrum? ___________________________________________________ ___________________________________________________ What is Sound? What is sound? _____________________________________ ___________________________________________________ How is sound made? _________________________________ ___________________________________________________ How does sound travel? ______________________________ ___________________________________________________ Characteristics of Sound Describe the following: Sound waves _______________________________________ Wavelength _______________________________________ Frequency _________________________________________ Volume ____________________________________________ Pitch ______________________________________________ Hertz (Hz) __________________________________________ Decibels ___________________________________________ Key Vocabulary Terms absorption refraction crest reflection decibel sound wave electromagnetic trough frequency ultraviolet gamma rays vibration Hertz visible spectrum microwave volume pitch wavelength radio wave X-rays Describe the following: Reflection _______________ _________________________ _________________________ Absorption ______________ _________________________ _________________________ Refraction _______________ _________________________ _________________________ \|xiBAHBDy01739kzU