Physics Sound and Light Waves

N cannot be less than

1

How many times louder is 70db sound over a 30db sound?

10^4

If a light ray strikes a flat mirror at an angle of 14 degrees from the normal, the reflected ray will be at what angle?

14

What is the speed of sound?

331.5 m/s

What is the distance in one light year?

9.4608x10^15

To change the speed of light traveling through air, you'd need to change the ____

Air temp or pressure

When a transmitted ray travels from a less dense medium to a more dense medium its speed ________

Decreases

The number of waves per second that a source makes is called the ___

Frequency

What are the wave properties responsible for "pitch" and 'loudness' respectively?

Frequency and amplitude

Which of the electromagnetic waves has the highest frequency?

Gamma rays

If the frequency of a sound wave is doubled then its wavelength will be ___ and the velocity will be ____.

Halved & unchanged

Which of the wave spectrum is commonly called a "heat wave" because warm objects emit them?

Infrared light

Which form of energy can be transmitted through a vacuum (empty space)?

Light

At the point of incidence where the ray strikes the mirror, a linge can be drawn perpendicular to the surface of a mirror. This line is known as a _______

Normal line

The frequency of a sound wave can also be called the ______

Pitch

What is the order of the electromagnetic spectrum? (going from longest to shortest wavelengths)

Radio, Infrared, Visible, UltraViolet, X-Rays, Gamma Rays.

The ray of light that leaves a mirror is known as the _____ _____

Reflected Ray

The law of Reflection states that the angle of _______ equals the angle of ______

Reflection, Incidence

The bending of light as it moves into a new medium is known as ______

Refractions

Supplying energy to an object at its natural frequency of vibration is ______?

Resonance

Light stimulates what part of the eye?

Retina

Equation for critical angle

Sin( oc= nr/ni or oc= Sin-1(nr/ni

Mach # equation

Speed of an object/speed of sound (331.5)

What happens to the angle of the refracted ray when light enters from a Less dense medium to more dense medium?

The angle of the refracted ray will become less than the angle of incident

what happens to the angle of the refraction when light enters from a More dense medium to a less dense medium?

The angle of the refracted ray will increase to more than the angle of incidence

What is a light year?

The distance traveled by light in 1 year. It is measured in meters

Why can't we hear "ultrasound" and "dog whistles"

The frequency is too high

When the amplitude of a sound wave increases:

The sound gets louder

fiberoptic cable, endoscopes, optical finger painting devices, automatic rain sensors are all examples of using the phenomenon of _____ ____ _____

Total internal reflection

what is it called when light passes from a more to less dense medium at an angle greater than the critical angle and there is no refracted ray, only a reflected ray

Total internal reflection

What is the source of energy of all sound waves?

Vibration

When is a frequency considered "subsonic"

When the frequency is greater than 20,000 Hz

When is a frequency considered "infrasonic"

When the frequency is less than 20 Hz

What is an echo?

a reflection of a sound

The angle between the incident ray and the normal is known as the ______ __ ____

angle of incidence

The angle between the reflected ray and the normal is known as the ___ __ ______

angle of reflection

when Light travels from a more dense into a less dense medium, the light will bend ______ from the medium

away

If light enters a new medium at a non-zero angle, this change in speed causes the light to _____

bend

"Sonic booms" usually sweep in a swath having a width of approximately five times the altitude of the aircraft. What type of interference is taking place in a sonic boom?

constructive

The _____ angle is the angle of incidence for which the angle of refraction is 90

critical

As the wavelength of a wave increases, the frequency will _____

decrease

Sound can not travel through

empty space

When a wave changes mediums, ______ always remain constant?

frequency

Which electromagnetic waves has the shortest wavelength?

gamma rays

compared to the speed of a sound wave in air, the speed of a radio wave in air is _____

greater

compared to frequencies of radio waves, the frequencies of infrared light are ____

higher

A ray approaching a mirror is known as the ____ ___

incident ray

The normal line divides the angle between the ______ ray and the _____ ray into two equal angles

incident ray, reflected ray

A car traveling at 90 km/hr approaches a bystander on the side of the road. The car honks its horn as it drives by the observer. If the horn has a frequency of 300 Hz, the bystander will hear a(n) _________ frequency as the car APPROACHES

increased

When a transmitted ray travels from a more dense medium to a less dense medium its speed ____

increases

A sound with a frequency of less than 20 hz is called ____.

infrasound/infrasonic

Radio waves are a type of ____ wave

light

As a sound wave travels through a medium, the particles of the medium vibrate in a direction parallel to the wave's travel. What type of wave is this?

longitudinal

What type of wave is a sound wave?

longitudinal

Sound is a _____

longitudinal wave

For a sound wave, "amplitude" means the same as ____

loudness

Total internal reflection only occurs when it goes from a ____ dense medium to a ______ dense medium

more, less

What is the equation for snell's law

ni x Sin(oi = nr Sin( or

Law of reflection equation

oi=or

Polarization refers to only allowing the wave vibrations to occur along ____ direction

one

Two sound waves are traveling through a container of unknown gas. Wave A has a wavelength of 1.2m. Wave B has a wavelength of 3.6m. The frequency of wave B must be ______ the frequency of Wave A

one third

______ transmission and ______ reflection occurs when the angle of incidence equals zero?

partial, partial

The "sound barrier" is a region of high ___ produced as an object approaches the speed of sound

pressure

Which of the electromagnetic waves has the longest wavelength?

radio waves

Two sound waves are traveling through a container of unknown gas. Wave A has a wavelength of 1.2m. Wave B has a wavelength of 3.6m. The velocity of wave B must be the ______ as the velocity of wave A.

same

Compared to wavelengths of visible light, the wavelengths of ultraviolet light are _____

shorter

Light is a ____ range of frequencies of electromagnetic waves that are part of the electromagnetic spectrum.

small

What causes an echo?

smooth & hard surfaces mades by enclosed solids that reflect sound

How do we find the angle of refraction?

snell's law

Which type of sound wave requires a material medium through which to travel?

sound

As a wave enters a new medium, the wave changes _____

speed

In air, all sound waves have the same ___.

speed

Transmitted rays change ____ , but keep going straight

speed

As the frequency of a wave increases, the velocity will ___

stay the same

Sound is a longitudinal wave because:

the Oscillations in pressure are in the same direction the wave moves

Ultrasound is just like ordinary sound EXCEPT:

the frequency is too high to be detected by our ears

The main difference between UV light and radio waves is ____

their wavelength

Light can pass completely through ____ materials

transparent

Electromagnetic waves can be polarized because they are ______ waves

transverse

What are the four examples of using sound waves in medical devices?

ultrasound, hearing aids, cochlear implants, stethoscopes

The index of refraction for any substance is defined as the ratio of the speed of light in a _______ to the speed of light in the medium

vacuum