3c-The electromagnetic spectrum Flashcards
What is the electromagnetic spectrum?
A: The electromagnetic spectrum is a continuous range of electromagnetic waves that travel at the same speed in free space (vacuum) at 3.0 × 10⁸ m/s.
What are the seven types of electromagnetic (EM) waves?A
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:
Radio Waves
Microwaves
Infrared (IR) Radiation
Visible Light
Ultraviolet (UV) Radiation
X-Rays
Gamma Rays
Q: How are EM waves ordered?
A: The electromagnetic spectrum is arranged in terms of decreasing wavelength and increasing frequency:
->Radio waves have the longest wavelength and lowest frequency.
->Gamma rays have the shortest wavelength and highest frequency.
What are the colors of the visible spectrum in order of increasing frequency?
A:
Red → Orange → Yellow → Green → Blue → Indigo → Violet (ROYGBIV)
Red has the longest wavelength, Violet has the shortest wavelength.
what is the use of EM wave\
Radui waves
Radio Waves
Broadcasting, Communications
what is the use of EM wave
Microwaves
Microwaves
Cooking, Satellite Communications
what is the use of EM wave
Infrared
Infrared (IR)
Heaters, Night Vision Equipment
what is the use of EM wave
Visible light
Visible Light
Optical Fibres, Photography
what is the use of EM wave
UV
Ultraviolet (UV)
Fluorescent Lamps, Security Markings
what is the use of EM wave
Xray
X-Rays
Observing Internal Structures (Medical Imaging)
what is the use of EM wave
Gamma rays
Gamma Rays
Sterilizing Food & Medical Equipment, Cancer Treatment
danger of
Microwaves
Microwaves
Internal heating of body tissue
danger of Infrared
Infrared (IR)
Skin burns
danger of Uv
Ultraviolet (UV)
Skin cell damage, blindness, skin cancer
Infrared: Use insulating materials to prevent burns.Infrared: Use insulating materials to prevent burns. of Gamma ray
Gamma Rays
Mutations, cancer
rotect against these dangers?
Microwaves
Microwaves: Use shielding in ovens, avoid prolonged exposure.
How can we protect against these dangers?A:
INfrared
Infrared: Use insulating materials to prevent burns.
e.
How can we protect against these dangers?A:
Gamma ray
Gamma Rays: Use lead shielding, limit exposure time.
How can we protect against these dangers?A:
UV
Ultraviolet: Wear sunscreen, sunglasses, limit sun exposure.
Practical: Investigating Infrared Radiation
Measuring Infrared Emission
Method: Use a Leslie cube with different surfaces (black, white, shiny, matte) and an infrared detector.
Observation: Dark and matte surfaces emit and absorb more infrared radiation.
Practical: Investigating Infrared Radiation
Investigating Light Transmission in Optical Fibres
Method: Shine a laser into an optical fibre and observe the total internal reflection.
Observation: Light remains trapped inside, enabling efficient data transmission.
