part 1
what is intensity?
the intensity or flux of radiant energy is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of the energy.
what unit is intensity measured?
what is constructive interference?
When two waves of identical wavelength are in phase, they form a new wave with an amplitude equal to the sum of their individual amplitudes
what is reflection?
Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves.
give an example of sound waves.
vibrating object in a medium, such as air, produces sound waves through the shifting of layers of air particles.
why are sound waves considered mechanical waves?
Sound energy, or energy associated with the vibrations created by a vibrating source, requires a medium to travel, which makes sound energy a mechanical wave.
are loudness and intensity the same?
Loudness is the measure of the response of the ear to the sound. Intensity is the sound power per unit area
what is destructive interference?
occurs where two waves are completely out of phase
what is refraction?
in physics, refraction is the redirection of a wave as it passes from one medium to another. The redirection can be caused by the wave's change in speed or by a change in the medium.
give an example of intensity.
having the ability to run miles on end at a top speed.
why are sound waves considered longitudinal waves?
Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves. A vibrating string can create longitudinal waves as depicted in the animation below.
what is the speed of sound and air?
about 761 mph
what is the doppler effect?
the change in frequency of a wave in relation to an observer who is moving relative to the wave source.
What is opaque?
not able to be seen through; not transparent.
what is the properties of sound waves
wavelength, amplitude, frequency, time period, and velocity.
what is the relationship between pitch and frequency?
The sensation of a frequency is commonly referred to as the pitch of a sound. A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave.
how does speed of sound change as sound passes through different mediums?
sound travels faster in liquids than in gases and quicker in solids than in liquids.
what is resonance?
Resonance describes the phenomenon of increased amplitude that occurs when the frequency of an applied periodic force is equal or close to a natural frequency of the system on which it acts.
what is diffraction?
Diffraction refers to various phenomena that occur when a wave encounters an obstacle or opening.
what is the speed of sound
343 m / s
what is the relationship between energy and amplitude?
The higher the amplitude, the higher the energy.
how is sound perceived in the outer ear, middle, and inner ear?
Sound waves travel from the outer ear and in through the auditory canal, causing the eardrum to vibrate. This in turn causes three small bones in the middle ear to move. The vibrations move through the fluid in the cochlea in the inner ear, stimulating thousands of tiny hair cells.
give an example of reflection.
reflection of light, sound and water waves.
What is absorption?
absorption is a physical or chemical phenomenon or a process in which atoms, molecules or ions enter some bulk phase – liquid or solid material.
what is frequency?
Frequency is the number of occurrences of a repeating event per unit of time.