#1
Which color of light has the longest wavelength?
Red
ExplanationRed light has the longest wavelength in the visible spectrum.
#2
What is the speed of light in a vacuum?
299,792,458 meters per second
ExplanationThe speed of light in a vacuum is approximately 299,792,458 meters per second.
#3
What is the phenomenon where light bends as it passes from one medium to another?
Refraction
ExplanationRefraction is the phenomenon where light bends as it passes from one medium to another.
#4
What is the unit of luminous flux?
Lumen
ExplanationLumen is the unit of luminous flux, measuring the total visible light emitted by a source.
#5
Which of the following colors has the highest frequency?
Blue
ExplanationBlue light has the highest frequency among visible colors.
#6
Which type of electromagnetic radiation is used in food microwaves?
Microwaves
ExplanationFood microwaves use microwaves, a type of electromagnetic radiation, for heating.
#7
What is the unit of frequency?
Hertz
ExplanationFrequency is measured in Hertz (Hz), representing the number of cycles per second.
#8
Which of the following electromagnetic waves has the highest frequency?
Gamma rays
ExplanationGamma rays have the highest frequency among electromagnetic waves.
#9
What happens to the wavelength of light as it passes from air into water?
Decreases
ExplanationThe wavelength of light decreases as it passes from air into water due to refraction.
#10
What is the relationship between frequency and wavelength of light?
They are inversely proportional
ExplanationFrequency and wavelength of light are inversely proportional to each other according to the wave equation.
#11
Which type of electromagnetic radiation is used in MRI scans?
Radio waves
ExplanationMRI scans use radio waves for imaging.
#12
Which type of lens corrects nearsightedness?
Concave lens
ExplanationA concave lens corrects nearsightedness by diverging light before it enters the eye.
#13
Which electromagnetic wave has the shortest wavelength?
Gamma rays
ExplanationGamma rays have the shortest wavelength among electromagnetic waves.
#14
What is the phenomenon where light spreads out after passing through a narrow slit?
Diffraction
ExplanationDiffraction is the phenomenon where light spreads out after passing through a narrow slit.
#15
Which phenomenon causes the sky to appear blue?
Scattering
ExplanationThe blue color of the sky is a result of Rayleigh scattering.
#16
What is the primary function of the cornea in the human eye?
To focus light onto the retina
ExplanationThe cornea helps in focusing light onto the retina in the human eye.
#17
What determines the color of an opaque object?
The absorption spectrum of the object
ExplanationThe color of an opaque object is determined by its absorption spectrum, indicating the wavelengths it absorbs.
#18
What is the primary function of the iris in the human eye?
To regulate the amount of light entering the eye
ExplanationThe iris regulates the amount of light entering the human eye.
#19
Which of the following colors has the highest energy per photon?
Blue
ExplanationBlue light has the highest energy per photon among visible colors.
#20
What is the primary function of the retina in the human eye?
To detect and process light
ExplanationThe retina in the human eye detects and processes light, converting it into neural signals for the brain.