The Ear
Name three parts of the ear…
Ossicles, Eardrum, Cochlea, Pinna, Auditory Canal, Semi-Circular canals
Name three parts of the eye…
Retina, Lens, Cornea, Iris, Rods and cones
There are two types of waves - what are they?
longitudinal
transverse
When light enters a glass block, what is the angle it enters at called?
Bonus 100: What is the angle it exits at called?
Angle of incidence,
Angle of refraction,
The frequency of waves is measured in which unit?
Hz
What does the eardrum do when sound reaches it?
it vibrates
Which two parts of the eye focus light on the retina?
The cornea and the lens
What is the distance between two crests or troughs called?
wavelength
What is the speed of light in space?
300,000,000 M\S
At what state of matter does sound travel fastest?
Bonus 200: Explain your answer
Solids
Bonus:In solids, the molecules are packed closely together, so they can pass vibration energy on faster. This means sound travels faster in solids than in liquids or gases
What part of the ear converts vibrations into electrical signals for the brain?
The cochlea
What are the two types of lenses?
Bonus 300: Which type of lens matches short/long sighted people?
Convex and Concave
Convex: Shortsightedness
Concave: Longsightedness
What is the speed of sound in the air?
340 M\S
In what scenario does light not bend when it enters a denser medium?
When the angle of incidence is facing 90 degrees to the glass block.
What is the human auditory range?
Bonus 300: What is a sound above 20,000HZ called?
20-20,000HZ
Ultrasound
If someone has damage to their auditory nerve, what will happen to their hearing?
They won’t be able to hear properly, even if the rest of the ear works, because the signals can't reach the brain.
What do rods and cones do? Which one does which?
They are photosensitive and detect light
Rods see black and white and are better at detecting light in dim conditions
Cones detect colour
What are the two types of sound waves humans can’t hear?
Infrasound and Ultrasound
Why does refraction happen?
What is the speed of sound in space?
It doesn’t travel in space as it is a vacuum.
What unit do we use to measure how loud a sound is?
If one sound is 20 of these units louder than another sound, how many times louder is it?
Decibels
Bonus: For every increase of 10 dB, the sound is 10 times as loud. So for 20dB, the sound is 100 times louder
Why do we see things upside-down on our retina but not in real life?
Our brain flips the image the right way round to help us make sense of what our eyes have detected
What is the highest and lowest frequency of wave on the Electromagnetic spectrum?
Highest: Gamma rays
Lowest: Radio waves
Which colour of light has the shortest wavelength: red, green or violet?
violet
If i increase the amplitude of a sound wave, what will happen to the sound?
The sound will be LOUDER
Amplitude is how big the vibrations are.
Bigger amplitude = louder sound
Smaller amplitude = quieter sound