Waves
Light
The Eye
Sound
The Ear
100
What is a mechanical wave?
Waves that require a medium to travel through
100
What type of wave is a light wave?
Electromagnetic transverse wave
100
Name two functions of the eyelid
Protection, cleaning and to keep the eye moist
100
What type of wave is a sound wave?
Mechanical longitudinal wave
100
What are the three parts of the ear?
Outer, middle and inner ear
200
What is an electromagnetic wave?
Waves that do not require a medium to travel through
200
What is a luminous object?
An object that emits its own light
200
Name two functions of the cornea
It bends light rays to help focus them on the retina
It's a barrier against dirt and microbes
It filters UV rays
It has a closure reflex as protection
200
Pitch is how high or low a sound is, it depends on the ______________ of a wave
Frequency
200
What are the two structures of the outer ear?
Ear canal and pinna
300
What is a longitudinal wave?
A wave in which vibrations travel parallel to the direction of the wave
300
Why do objects look blurry when viewed through a translucent object?
Because some of the light ways scatter (change direction)
300
Why does the size of the iris and pupil change?
To control the amount of light that enters the eye
300
Name two ways in which we can use sound as a practical tool
Prenatal scans (ultrasound)
To survey the ocean
To clean medical tools
To check for crack in pipes
300
What is the main function of the ossicles?
It vibrates when energy is transferred to it from vibrating air particles
400
What is the rest or equilibrium in a wave?
The undisturbed position of the particles
400
What does the Law of Reflection states?
The angle of incidence is the same as the angle of reflection
400
What is accomodation?
When the lens changes shape (by the ciliary muscles) to focus on near or distant objects
400
What is an echo?
When a sound wave is reflected
400
Which structure creates electrical impulses from vibrations?
The tiny hairs inside the cochlea
500
What part of a wave we represent with the greek letter Lambda?
Wavelenght
500
Complete the sentence:
Each of the colors of light has a different ___________
Frequency
500
What two types of cells we have in our retinas?
Cones and rods
500
In a thunderstorm why is lightning observed before thunder is heard?
Because through air light travels faster than sound
500
Name the three ossicles
Hammer, Anvil and Stirrup