Vibrations and Waves
____ are waves.
what is a repeating disturbance or movement that transfers energy through matter or space?
A pressure variation that is transmitted through matter.
What is a Sound Wave?
The Sun is ____
a luminous source, an object that emits light.
parallel light rays are reflected in parallel are
Specular Reflection
a certain angle of incidence
critical angle
Periodic Motion.
what 2 words describe a metal block bobbing up and down on a spring and a vibrating guitar string?
Marin Mersenne and Galileo
Who first determined pitch?
The rate at which light energy is emitted from a luminous source
luminous flux
a diffuse reflection is...
the scattering of light off a rough surface
occurs when light traveling from a region of a higher index of refraction to a region of a lower index of refraction strikes the boundary at an angle greater than the critical angle such that all light reflects back into the region of the higher index of refraction
Internal Reflection
Hookes Law.
What Law includes the force exerted by a spring is equal to the spring constant times the distance the spring is compressed or stretched from its equilibrium position?
Frequency and Wavelength
What are the 2 Characteristics of loudness?
illuminance is...
The illumination of a surface, or the rate at which light strikes the surface
The angle that a reflected ray makes as measured from the normal to a reflective surface equals the angle that the incident ray makes as measured from the same normal.
Law of Reflection
The product of the index of refraction of the first medium and the sine of the angle of incidence is equal to the product of the index of refraction of the second medium and the sine of the angle of refraction.
Snells law of Refraction
Two springs look alike but have different spring constants. How could you determine which one has the greater spring constant?
Hang the same object from both springs. The one that stretches less has the greater spring constant.
What is necessary for the production and transmission of sound
a vibrating object and a material medium.
Why does an object appear to be black?
An object appears to be black because little, if any, light is being reflected from it.
If a mirror produces an erect, virtual image, can you immediately say it is a plane mirror?
No, convex mirrors produce virtual images, and concave mirrors, at certain points, produce virtual images
How does the speed of light change as the index of refraction increases?
As the index of refraction value increases, the optical density increases, and the speed of light in that material decreases.
If a car’s wheel is out of balance, the car will shake strongly at a specific speed, but not when it is moving faster or slower than that speed. Explain.
At that speed, the tire’s rotation frequency matches the resonant frequency of the car.
How can a certain note sang by an opera singer cause a crystal glass to shatter?
The frequency of the note is the same as the natural resonance of the crystal, causing their molecules to increase their amplitude of vibration as energy from sound is accepted.
Sound does not travel through a vacuum. How do we know that light does?
he sound wave gets smaller and smaller until it disappears. In contrast, lightwaves can travel through a vacuum and do not require a medium
Describe the physical properties of the image of a person seen in a plane mirror.
inverted, virtual, twice the distance from the mirror than the object, same size as the object.
A prism bends violet light more than it bends red light. Explain.
violet light has a shorter wavelength, it would refract more than the longer wavelength red light. The refraction of light at the entry location into the rectangular glass prism would cause a little separation of the white light.