EMS
EMS Uses
Light Behaviors
Mirrors
Lenses
100
True or false: Electromagnetic waves can travel WITHOUT a medium. (Bonus: 100 pts - what type of waves are in the electromagnetic spectrum?)
True; Bonus: Transverse waves
100
What type of electromagnetic wave is commonly used to heat food?
Microwaves
100
What happens to light when it bounces off a surface like a mirror?
Reflection
100
What type of mirror is flat and reflects an image with the same size and shape as the object?
A plane mirror
100
Pick the correct term to complete the sentence below:
Lenses ( reflect / refract / absorb ) light.
refract
200
True or false: Gamma rays are FASTER than radio waves.
False; all types of waves on the electromagnetic spectrum are the same speed (speed of light).
200
Which type of electromagnetic wave is associated with heat? Used in thermal scopes and heat maps.
Infrared waves
200
What occurs when light passes through a transparent material and bends?
Refraction
200
What type of mirror curves inward like the inside of a bowl?
Concave mirror
200
What type of lens is thicker in the middle and thinner at the edges?
Convex lens
300
What is the smallest part of the electromagnetic spectrum?
Visible light
300
List two uses for x-rays, a part of the electromagnetic spectrum.
1. Used by doctors to look at bones
2. Used in airport security to see through luggage
300
What usually happens to light when it is absorbed by a material?
The material converts the light energy into heat or thermal energy.
300
What type of mirror curves outward like the back side of a spoon?
Convex mirror
300
What type of lens is thinner in the middle and thicker at the edges?
Concave lens
400
Complete the sentence below:
On the electromagnetic spectrum, _________ waves have the lowest amount of energy whereas _________ rays have the highest amount of energy.
radio; gamma
400
List two examples of where you would find ultraviolet waves, a part of the electromagnetic spectrum.
1. Tanning beds
2. Sterilization of objects
3. UV rays from the sun
400
Using the image below, complete the following sentence:
Visible light is best absorbed by _____________ and best reflected by ____________.
black; white
400
Complete the following sentence:
Concave mirrors ___________ light whereas convex mirrors ____________ light.
(Hint: Does the light come together or spread apart?)
converge; diverge
400
Complete the following sentence:
Concave lenses ___________ light whereas convex lenses ____________ light.
(Hint: Does the light come together or spread apart?)
diverge; converge
500
What is the relationship between wavelength and frequency in the electromagnetic spectrum?
Inverse relationship; as frequency increases, wavelength decreases and vice versa.
500
What type of electromagnetic wave is used to target and kill cancer cells? Explain why this type is used. (Hint: think of the wavelength/frequency)
Gamma rays; gamma rays are used to target and kill cancer cells because they have the highest amount of energy on the electromagnetic spectrum. This high energy allows gamma rays to penetrate deeply through the body.
500
The following image shows the angle of refraction in water vs in oil.
What best explains the difference in the angle of refraction?
(Hint/Sentence starter: There is a difference in the angle of refraction because light travels...)
There is a difference in the angle of refraction because light travels at different speeds through different substances.
500
What image is created with a convex mirror, such as a car mirror or a security mirror?
The image is upright and reduced; you can see more of your surroundings.
500
What image is created with a convex lens from a distance?
Inverted and reduced