#1
Which of the following statements about electromagnetic radiation is true?
It requires a medium for propagation.
It can travel through a vacuum.
Its speed is slower than sound.
It consists only of visible light.
#2
What is the speed of light in a vacuum?
300,000 km/s
150,000 km/s
500,000 km/s
1,000,000 km/s
#3
What is the electromagnetic spectrum?
A spectrum of colors seen in a rainbow.
A range of frequencies of electromagnetic waves.
The reflection of light from a surface.
The speed of light in a vacuum.
#4
Which unit is used to measure the intensity of electromagnetic radiation?
#5
What is the electromagnetic radiation responsible for sunburns?
Ultraviolet radiation
Infrared radiation
Visible light
Microwaves
#6
What is the relationship between wavelength and frequency of electromagnetic waves?
They are inversely proportional.
They are directly proportional.
They have no relationship.
The relationship depends on the medium.
#7
Which electromagnetic wave has the highest frequency?
Radio waves
Microwaves
X-rays
Infrared radiation
#8
Which electromagnetic wave is commonly used in medical imaging, such as X-rays for bone imaging?
Microwaves
Infrared radiation
Visible light
X-rays
#9
What phenomenon causes the sky to appear blue during the day?
Scattering
Reflection
Refraction
Diffraction
#10
Which color of visible light has the longest wavelength?
#11
What is the primary source of natural electromagnetic radiation on Earth?
#12
What is the Doppler effect in the context of electromagnetic waves?
The change in frequency or wavelength of a wave in relation to an observer moving relative to its source.
The interference of two waves of the same frequency.
The bending of light waves around obstacles.
The reflection of light from a surface.
#13
What is the photoelectric effect?
The emission of electrons from a metal surface when exposed to light.
The bending of light waves around obstacles.
The reflection of light from a smooth surface.
The change in color of an object due to temperature.
#14
In the electromagnetic spectrum, which region has the longest wavelengths?
Ultraviolet
Microwaves
Radio waves
Infrared
#15
Which scientist is credited with the development of the theory of electromagnetism?
Isaac Newton
James Clerk Maxwell
Albert Einstein
Michael Faraday
#16
What is the relationship between the energy of an electromagnetic wave and its frequency?
Directly proportional
Inversely proportional
No relationship
Depends on the medium
#17
What is the purpose of a Faraday cage?
To generate electromagnetic waves.
To block electromagnetic waves.
To amplify electromagnetic waves.
To change the frequency of electromagnetic waves.
#18
What is the phenomenon of total internal reflection in optics?
Bending of light around obstacles.
Reflection of light from a smooth surface.
Reflection of light within a medium at an angle greater than the critical angle.
Diffraction of light waves.
#19
In the electromagnetic spectrum, which region has the shortest wavelengths?
Gamma rays
Ultraviolet
X-rays
Visible light