Light, Sound, Mirrors Flashcards
What is true for all convex mirrors?
They reflect light so that it looks to be diverging from a point behind the mirror
What is true for all concave mirrors?
The greater the curvature of the mirror, the shorter the focal length
What is true for all concave mirrors in terms of light?
Light is reflected and converges to a point close to the mirror
What type of image do flat mirrors make?
A virtual, laterally inverted image which is the same distance behind the mirror as the object is in front
Which type of reflection occurs with a glass mirror?
Specular reflection
Which type of reflection occurs with plastic wrap?
Transparent transmission reflection
Which type of reflection occurs with baking paper?
Translucent transmission reflection
Which type of reflection occurs with a black jumper?
Opaque absorption reflection
Which type of reflection occurs with aluminium foil?
Diffuse reflection
What is an example of incandescent light?
A candle
Is the moon luminous?
No
What are some examples of luminous objects?
Star, lit candle, turned on light globe
Place the materials helium, steel and water in ascending order in terms of speed of sound?
Helium, water, steel
What is the decibel reading of a quiet outdoor setting?
45 decibels
What is the decibel reading of a normal classroom?
70 decibels
What is the decibel reading of the threshold of pain?
120 decibels
What is the decibel reading of an overhead aircraft?
130 decibels
What is sound caused by?
Vibration
What is sound?
A mechanical wave, caused by an oscillation through a solid, liquid or gas
What is the speed of light through a vacuum or air?
300,000 km/s
What is the connection between the amplitude and sound of a wave?
The larger the amplitude of the wave, the louder the sound
What is the connection between the number of waves and the pitch of the sound?
The more the number of waves, the higher the pitch of the sound
Through which state of matter are vibrations/sound passed through most easily?
Solids, because the particles are closer together than in a liquid or gas
How do you calculate the time light has taken to travel?
By dividing the distance by the speed
How do you calculate the speed that light has travelled at?
By dividing the distance by the time
How do you calculate the distance that light has travelled?
By multiplying the speed by the time
What unit of measurement is the time of light travelling calculated in?
Seconds
What unit of measurement is the speed of light travelling calculated in?
V (m/s)
What unit of measurement is the distance that light travels calculated in?
Kilometres
Where does light travel fastest?
In outer space
What do all plane mirrors show?
A virtual image of the same size
