e Flashcards
(25 cards)
What are electromagnetic waves?
Electromagnetic waves are waves that can travel through the vacuum of space and consist of oscillating electric and magnetic fields.
True or False: Electromagnetic waves require a medium to travel.
False
Fill in the blank: Electromagnetic waves travel at the speed of _____ in a vacuum.
light
Name the seven types of electromagnetic waves in order from longest wavelength to shortest.
Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, gamma rays.
What is the wavelength of a wave?
The wavelength is the distance between two consecutive peaks or troughs of a wave.
Which type of electromagnetic wave has the highest frequency?
Gamma rays
True or False: Visible light is a type of electromagnetic wave.
True
What is the frequency of a wave?
The frequency is the number of waves that pass a point in one second.
Multiple Choice: Which electromagnetic wave is commonly used for communication?
Radio waves
What is the relationship between wavelength and frequency?
As the wavelength increases, the frequency decreases.
Fill in the blank: The electromagnetic spectrum includes all types of electromagnetic waves, from _____ to _____ wavelengths.
longest, shortest
Which electromagnetic wave can be felt as heat?
Infrared waves
True or False: X-rays can penetrate soft tissues but are blocked by bones.
True
What is the unit of frequency?
Hertz (Hz)
Multiple Choice: Which type of electromagnetic radiation is used to sterilize medical equipment?
Gamma rays
What is the main source of natural electromagnetic waves?
The Sun
Fill in the blank: Ultraviolet rays can cause _____ damage to the skin.
sun
Which electromagnetic wave can be seen by the human eye?
Visible light
True or False: Microwaves are used to heat food.
True
What is the range of wavelengths for visible light?
Approximately 400 to 700 nanometers.
Multiple Choice: Which type of electromagnetic wave has the longest wavelength?
Radio waves
What is the effect of increasing frequency on the energy of electromagnetic waves?
The energy increases.
Fill in the blank: The _____ of a wave is inversely related to its wavelength.
frequency
True or False: All electromagnetic waves travel at the same speed in a vacuum.
True
