#1
What is the speed of electromagnetic waves in a vacuum?
299,792,458 meters per second
ExplanationSpeed of light in a vacuum.
#2
What is the electromagnetic spectrum?
A range of frequencies of electromagnetic radiation
ExplanationA spectrum encompassing all frequencies of electromagnetic radiation.
#3
Which scientist is credited with formulating the theory of electromagnetism?
Michael Faraday
ExplanationMichael Faraday formulated the theory of electromagnetism.
#4
What is the SI unit of frequency?
Hertz
ExplanationHertz is the SI unit of frequency.
#5
What is the frequency range of visible light?
430 THz to 750 THz
ExplanationVisible light has a frequency range of 430 THz to 750 THz.
#6
Which of the following equations represents the relationship between the speed of light (c), wavelength (λ), and frequency (f) of an electromagnetic wave?
c = λ*f
ExplanationSpeed of light equals wavelength times frequency.
#7
Which of the following electromagnetic waves has the shortest wavelength?
Gamma rays
ExplanationGamma rays have the shortest wavelength among electromagnetic waves.
#8
What is the relationship between the electric field (E) and the magnetic field (B) in an electromagnetic wave?
They are perpendicular to each other and oscillate in phase
ExplanationElectric and magnetic fields in electromagnetic waves are perpendicular and in phase.
#9
Which of the following materials is typically transparent to visible light but opaque to ultraviolet radiation?
Aluminum foil
ExplanationAluminum foil is transparent to visible light but opaque to ultraviolet radiation.
#10
Which of the following electromagnetic waves is used in MRI (Magnetic Resonance Imaging) machines?
Radio waves
ExplanationRadio waves are used in MRI machines.
#11
In which medium do electromagnetic waves travel the fastest?
Vacuum
ExplanationElectromagnetic waves travel fastest in a vacuum.
#12
What phenomenon allows the bending of electromagnetic waves around obstacles?
Diffraction
ExplanationDiffraction permits electromagnetic waves to bend around obstacles.
#13
What is the primary mechanism by which electromagnetic waves transfer energy?
Absorption
ExplanationElectromagnetic waves transfer energy primarily through absorption.