25 questions
Which is the shortest electromagnetic wave?
gamma
x-ray
ultraviolet
sound
Which is the longest electromagnetic wave?
gamma
radio
ultraviolet
microwave
What produces electromagnetic waves?
the vibration of neutrons
molecular collisions
gamma radiation
the vibration of charged particles
Which is an example of a radio wave?
television
lasers
remote controls
cancer treatments
The portion of the electromagnetic spectrum that humans can see is called:
radio waves
visible light
gamma rays
x-rays
What is the term for the process of transferring light energy to the molecules in a material?
transmission
absorption
scattering
refraction
A pencil that is half underwater and half above the water appears to be broken because of which light behavior?
absorption
transmission
reflection
refraction
Which graphic demonstrates scattering?
This refers to the part of the EM spectrum which can be detected by the human eye.
Gamma Rays
X - ray
Ultraviolet rays
Visible Light
They have the shortest wavelengths and highest frequencies in the EM spectrum and they usually come from radioactive elements or stars.
Gamma Rays
X - ray
Ultraviolet rays
Visible Light
It is used as diagnostic tool in dentistry and medicine. Doctors and dentists can examine the condition of a person’s bones, the root of this teeth or the state of other inner part of the body.
Gamma Rays
X - ray
Ultraviolet rays
Visible Light
It is used in hospitals to sterilize the surgical instruments and operating theatres as it kills bacteria and viruses.
Gamma Rays
X - ray
Ultraviolet rays
Visible Light
One of their most common uses is in microwave ovens. When you switch on a microwave oven , it gives off electromagnetic waves that bounce around inside the oven, penetrating the food. Water molecules in the food absorb the energy from the microwaves, causing the food to get hot.
Infrared Rays
Radio waves
Microwaves
Cyan
This wave is used by the Military for night vision and all objects emit this waves because all objects possess heat.
Infrared Rays
Radio waves
Microwaves
Cyan
Which of these lists the EM waves from Highest to lowest frequency?
Radio - Micro - Gamma - Visible light - UV - Xrays - Infrared - Xrays
Radio - Micro - Infrared - Visible light - UV - X - Gamma waves
Gamma - Xray - UV - Visible light - Infrared - Micro - radio
none
Which type of electromagnetic radiation is used extensively in communications?
radio waves
gamma rays
infrared rays
X-rays
Which property determines the amount of energy for an ELECTROMAGNETIC wave?
amplitude
frequency
particle size
medium
Microwaves are the electromagnetic waves with the longest wavelengths and lowest frequencies.
True
False
Most of you might have seen infra-red waves in use during the SARS period. It shows a thermo-detector which is placed outside hospitals/airport to identify the warm and cool parts of a person by analyzing infra-red radiation emitted from the person’s body. And through this we can see if someone is having a fever.
True
False
Night vision goggles detect infrared waves and allow the user to see the movement of objects in the dark.
True
False
The Visible light is determined by the frequency of the light.
True
False
The main source of microwave is sunlight and it is this radiation which gives rise to suntan and also sunburn.
True
False