Chapter 13: Electromagnetic Spectrum Flashcards

Master definitions

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1
Q

Define

Electromagnetic waves

Hint: in the name

A

Group of waves that consists of magnetic and electric field wave. Different wavelengths of electromag waves form the electromagnetic spectrum

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2
Q

List

electromagnetic spectrum from highest freq to lowest

Low freq= long wavelength, high freq= short wavelength

A

Gamma ray(>10^18), Xray(10^16-18), Ultraviolet ray(10^14-16), Visible light(10^14), Infrared radiation(10^12-14), Microwaves(10^9-12), Radiowaves(<10^9)

Low freq= long wavelength, long freq= short wavelength

Grandma X usually likes Indian Muslim Rojak

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3
Q

MCQ

Properties of electromagnetic waves

v = λ f!

  1. Transverse or longitudinal, 2. Can Travel in vacuum?
A

Transverse, yes

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4
Q

Speed of electromagnetic waves

What is the speed of waves dependent on

v = λ f!

A

3x10^8 m/s

dependent on medium

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5
Q

List

Uses of Radiowaves

List

A
  • Radio Astronomy
    * involves detecting and studying RW’s produced by planets & stars
  • Radio Frequency Identification Tags (RFID tags)
    * contains small thin circuit. Reader device sends radio wave to tag, tag transmits back data to reader (commonly used to tag library books, etc.)
  • Television & communication purposes
    * Longer wavelength radio waves are used as they can better travel ard obstacles like mountains

RW= radio waves

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6
Q

List

Uses of microwaves

A
  • Microwave Ovens
  • Carries signals to and from satellites for satellite television, GPS, and phone communication
    * able to penetrate atmosphere, travel through haze, snow, light rain, cloud and smoke
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7
Q

List

Uses of Infrared Radiation

A
  • Intruder alarms
  • Infrared cameras
  • Remote controllers
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8
Q

List

Visible Light

A
  • allows us to see
  • Used in optical fibres
  • Photography
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9
Q

List

UV radiation

A
  • Sunbeds for artificial tanning
  • Sterilisation of equipment and water(e.g. NEWater is disinfected using UV )
  • Bank note authentication(authentic bank notes have pigments that glow under UV light)
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10
Q

LIst

X-ray

A
  • Used in chemotherapy
  • Used for imaging for making medical diagnosis
  • Used for imaging or security checks
  • Industrial defect detection
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11
Q

List

Gamma rays

A
  • Targeted radiation therapy
  • Sterilising food
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12
Q

Types of Ionising radiation

2 types

A
  1. Electromagnetic radiation 2. Nuclear radiation
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13
Q

Define

Ionising radiation

A

higher frequency forms of radiation that has sufficient energy to cause ionisation of medium through which it pass

ionisation- knock out an electronm from a particular atom or molecule

able to penetrate deep into the body making them extremely harmful

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14
Q

name

effect of ionising radiation on living cells

A
  1. death of living cells
  2. mutation of living cells, leading to organ failure and diseases
  3. heating up of living cells
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15
Q

name

types of electromag waves that are ionising radiation

A
  1. Gamma rays
  2. X-rays
  3. Ultraviolet rays
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