#1
Which of the following electromagnetic waves has the shortest wavelength?
Gamma rays
ExplanationHighest energy, shortest wavelength radiation.
#2
What is the primary application of infrared radiation?
Night vision
ExplanationUsed in devices to detect heat signatures.
#3
What is the speed of light in a vacuum?
300,000 km/s
ExplanationUniversal constant in a vacuum.
#4
Which electromagnetic radiation is responsible for sunburns?
Ultraviolet rays
ExplanationCan cause DNA damage in skin cells.
#5
Which electromagnetic radiation is used in microwave ovens for heating food?
Microwaves
ExplanationPenetrates food, causing water molecules to vibrate.
#6
Which electromagnetic wave is used for communication with satellites?
Microwaves
ExplanationLonger than infrared but shorter than radio waves.
#7
What is the primary function of a Faraday cage?
To block electromagnetic radiation
ExplanationProtects from external electromagnetic fields.
#8
What is the primary application of visible light?
Phototherapy
ExplanationUsed in treatment for various medical conditions.
#9
Which electromagnetic radiation is used in Wi-Fi technology?
Microwaves
ExplanationEnables wireless networking.
#10
Which electromagnetic radiation is used in laser technology?
Visible light
ExplanationProduces coherent light for various applications.
#11
Which electromagnetic radiation is used in magnetic resonance imaging (MRI)?
Radio waves
ExplanationExcites hydrogen atoms in the body to create images.
#12
What is the primary application of gamma rays in medicine?
Cancer treatment
ExplanationDestroys cancerous cells.
#13
Which electromagnetic radiation is used in remote sensing of Earth's surface?
Microwaves
ExplanationPenetrates clouds and foliage.
#14
Which electromagnetic radiation is used in electron paramagnetic resonance (EPR) spectroscopy?
Microwaves
ExplanationStudies properties of unpaired electrons.
#15
Which electromagnetic radiation is used in photolithography for semiconductor manufacturing?
Ultraviolet rays
ExplanationCreates fine patterns on semiconductor wafers.