MISA Waves and Electromagnetic Radiation 1 — Questions and Answers
Question 1: What is the relationship between the frequency and wavelength of an electromagnetic wave?
- They are directly proportional — higher frequency means longer wavelength
- They are inversely proportional — higher frequency means shorter wavelength (Correct answer)
- They are independent of each other
- They are equal when measured in the same units
Correct answer: They are inversely proportional — higher frequency means shorter wavelength
Frequency and wavelength are inversely proportional; as frequency increases, wavelength decreases, since wave speed equals frequency times wavelength.
Question 2: Which region of the electromagnetic spectrum carries the most energy per photon?
- Radio waves
- Visible light
- Infrared radiation
- Gamma rays (Correct answer)
Correct answer: Gamma rays
Gamma rays have the highest frequency and shortest wavelength in the electromagnetic spectrum, giving them the greatest energy per photon.
Question 3: Sound waves traveling through air are best classified as which type of wave?
- Transverse waves
- Longitudinal waves (Correct answer)
- Electromagnetic waves
- Surface waves
Correct answer: Longitudinal waves
Sound waves are longitudinal (compressional) waves in which particle displacement is parallel to the direction the wave travels.
Question 4: What wave property determines the pitch of a sound?
- Amplitude
- Wavelength in vacuum
- Frequency (Correct answer)
- Speed in air
Correct answer: Frequency
Pitch is determined by frequency; higher-frequency sound waves produce higher-pitched sounds.
Question 5: Which color of visible light has the longest wavelength?
- Violet
- Green
- Blue
- Red (Correct answer)
Correct answer: Red
Red light has the longest wavelength (approximately 620–750 nm) of all colors in the visible spectrum, meaning it also has the lowest frequency among visible colors.
Question 6: What happens to the speed of light when it passes from air into water?
- It increases because water is denser
- It decreases because water is denser (Correct answer)
- It remains the same in all transparent media
- It increases because water has a lower refractive index than air
Correct answer: It decreases because water is denser
Light slows down when entering a denser medium like water because the index of refraction of water is greater than that of air.
Question 7: Which of the following is NOT an example of an electromagnetic wave?
- X-rays
- Ultraviolet light
- Sound waves (Correct answer)
- Microwaves
Correct answer: Sound waves
Sound waves are mechanical waves that require a medium to travel through, whereas electromagnetic waves can travel through a vacuum.
MISA Waves and Electromagnetic Radiation 1
What is the relationship between the frequency and wavelength of an electromagnetic wave?