Sound and Light The Nature of Light Sound and Light Sound and Light

Constructive and Destructive Interference Sound and Light

Light Can Be Modeled As a Wave Light Diffracts like a wave Light also reflects and refracts Sound and Light

Max Planck and Albert Einstein Nobel prize winners in physics Discovered that light, which usually travels in waves, sometimes behaves as if it were made up of a stream of small quantities, or quanta, of energy Sound and Light

Photon Small unit of light energy or electromagnetic radiation. “Packets” No mass, bundle of energy. The energy, E, of a photon is calculated using the equation E = hu, Where h is Planck's constant and u is the frequency of the light. Sound and Light

Atoms Emit Energy As Photons Absorbs Energy Sound and Light

Sometimes Light is modeled as a Stream of Particles Explains why light can travel through the vacuum of space Light can knock electrons off a metal plate Sound and Light

Light Has a Dual Nature Duality Different characteristics depending on the situation Scientists use different models depending on what they are studying Sound and Light

Photon Self-identity Problems Sound and Light

Energy of Light Is Proportional to Frequency Light is a form of energy. The energy, E, of a photon is E = hu, Where h is Planck's constant and u is the frequency of the light. Sound and Light

The Speed of Light In a vacuum it is called ‘c’ Depends on the medium Sound and Light

½ of a millionth of a second Where you are: Source of light: Time to get there: Home Plate Outfield fence 125m (410ft) ½ of a millionth of a second Soccer goal Other goal 100m (328ft) 1/3 of a millionth of a second Earth Moon 376,280km 233,810 miles 1 ¼ seconds Sound and Light

Proxima Centauri, the nearest star 41,000,000,000,000 km 4 1/3 years Where you are: Source of light: Time to get there: Earth Sun 150,000,000 km (93,000,000 miles) 8 1/3 minutes Proxima Centauri, the nearest star 41,000,000,000,000 km 4 1/3 years Sound and Light

The Brightness of Light Depends on the Intensity The rate at which light energy flows through a given area of space is referred to as its intensity. Sound and Light

The Brightness of Light Depends on the Intensity Light waves spread out spherically from the source Therefore intensity will drop as distance increases Sound and Light

Exploring the Electromagnetic Spectrum Sound and Light

Radar System that uses reflected radio waves Determine distance, location, shape and speed Sound and Light

Sound and Light 12.3 Reflection and Color Sound and Light Physics For Scientists And Engineers Sound and Light Sound and Light

Light Can Be Modeled As a Ray Light ray is a model of light Represents light traveling through space in an imaginary straight line Sound and Light

When Light Rays Reflect off a Smooth Surface, They Are Reflected in the Same Direction. Sound and Light

When Light Rays Reflect off a Rough Surface, They Scatter in Many Different Directions. Diffuse reflection Sound and Light

The Law of Reflection States that when light rays reflect off a surface the angle of incidence equals the angle of reflection. Sound and Light

The Law of Reflection Ө = Angle of Ө’ = Angle of incidence reflection Sound and Light

Normal The theoretical line perpendicular to the surface where light hits a mirror. Sound and Light

Virtual Image An image that results from an apparent path of light rays Appears behind a mirror Or in front of a lens Sound and Light

Flat Mirror Sound and Light

Real Image Light rays really exist at the point where the image appears. Appears in front of a mirror. Or through a lens. Sound and Light

Concave and Convex Mirrors Sound and Light

Concave Mirrors Can create real images Sound and Light

Fun House Mirrors Sound and Light

Reflection of Green Light by Leaves Life Science, Holt Science and Technology, California edition, Holt Rinehart and Winston, San Francisco, 2001 Sound and Light

Seeing Color Objects have color because they reflect certain wavelengths of light The object absorbs all the other colors Your brain interprets each wavelength as color Sound and Light

Colored Filters Sound and Light

You look at a red tulip, with green leaves, under green light You look at a red tulip, with green leaves, under green light. What would you see? A black flower with green leaves Sound and Light

The Primary Colors of Light and Pigment Light Pigment Additive Subtractive Sound and Light

Primary Colors of Printing Sound and Light

What are the True Colors? Sound and Light

Sound and Light

Refraction, Lenses and Prisms Sound and Light 12.4 Refraction, Lenses and Prisms Sound and Light

Refraction Bending of light rays From one medium to another Due to changing speeds Sound and Light

When light moves from a material in which its speed is higher to a material in which its speed is lower, it is… Bent toward the normal. Sound and Light

The ray is bent away from the normal If a light moves from a material in which its speed is lower to one in which its speed is higher, The ray is bent away from the normal Sound and Light

Refraction in the Atmosphere Creates mirages Are a virtual image Heat leads to diffraction that bends the light toward the sky Sound and Light

Total Internal Reflection Light enters one end of a fiber optic cable and exits the other end Complete reflection Between two mediums Angle of incidence exceeds the critical angle Sound and Light

Convex Lens Sound and Light

Convex Lens Sound and Light

Convex Lens Sound and Light

Concave Lens Sound and Light

diverging lenses Concave Len. It bends light outward and can only create a virtual image. Sound and Light

The Eye the cornea is responsible for the largest percentage of light refraction Sound and Light

Camera Sound and Light

Prism Sound and Light

Dispersion The effect in which white light separates into different colors Due to changes in wave speed of the different colors Sound and Light

White Light contains all the colors of the rainbow Sound and Light

Rainbows Caused by dispersion And internal reflection Sound and Light

Sound and Light

Harmonics, Amplitude Law of reflection Real image, virtual image Study Guide Pitch of a sound   Cornea Harmonics,  Amplitude Law of reflection   Real image, virtual image Diverging lens   Electromagnetic spectrum Sound and Light

Intensity, sound and light Resonance particle and wave models of light energy of a photon Diffuse reflection   Color, frequency  Refraction, normal  total internal reflection.  Prism and differences in wave speed   Sound and Light

6. An orange looks orange because it a 6. An orange looks orange because it a. reflects orange light and absorbs other colors. Sound and Light

a. bent toward the normal. 7. When light moves from a material in which its speed is higher to a material in which its speed is lower, it is a. bent toward the normal. 28. If a light moves from a material in which its speed is lower to one in which its speed is higher, the ray is bent away from the normal Sound and Light

9. Which structure within eye? b. the cornea is responsible for the largest percentage of refraction of light Sound and Light

c. relative intensity of different harmonics in each note. 12. The unique sound quality of a clarinet or a violin is caused by the c. relative intensity of different harmonics in each note. Sound and Light

18. A virtual image caused by reflection of light in the atmosphere is called d. a mirage. Sound and Light

a. differences in wave speed. 10. White light breaks up into different colors when it passes through a prism because of a. differences in wave speed. Sound and Light

Sound and Light