Science q2 g10

• What are the longest wavelengths of radio waves?

  They range from about 0.04 inches (1 millimeter) to more than 62 miles (100 kilometers).
• What are the lowest frequencies of radio waves?

  They range from about 3,000 cycles per second or 3 kilohertz, up to about 300 billion hertz or 300 gigahertz.
• Who was the first person to transmit and receive controlled radio waves?

  Heinrich Hertz.
• What is the unit of frequency of an electromagnetic wave?

  The unit is called a hertz (Hz).
• What is the process of sound wave transmission in radio communication?

  1. Sound waves enter the microphone and are converted into electrical impulses.
  2. The electrical impulses are converted into radio waves and broadcast by the transmitter.
  3. The radio waves reach a radio receiver and are converted back into sound.
• How does AM differ from FM in radio waves?

  AM has a constant frequency with varying amplitude, while FM has a constant amplitude with varying frequency.
• Why does FM result in better signal quality than AM?

  Because environmental factors do not affect the frequency the way they affect amplitude.
• What do microwaves cause to happen in water and fat molecules?

  They cause the molecules to vibrate, making the substances hot.
• What technology uses microwaves for communication?

  Mobile phones use microwaves.
• What are some applications of microwaves besides mobile phones?

  They are used by fixed traffic speed cameras and for radar.
• What health risk is associated with prolonged exposure to significant levels of microwaves?

  It can cause cataracts in the eyes.
• Why do people working on aircraft carrier decks wear special suits?

  To reflect microwaves and avoid being "cooked" by powerful radar units.
• Where do infrared waves fall in the electromagnetic spectrum?

  They are just below visible red light.
• What are some sources of infrared waves?

  They are given off by hot objects, stars, lamps, and flames.
• How are infrared waves used in physiotherapy?

  Heat lamps are used to help heal sports injuries.
• What is the function of "Passive Infra-Red" (PIR) detectors?

  They are used in burglar alarm systems and to control security lighting.
• How do police helicopters use infrared technology?

  They track criminals at night using thermal imaging cameras.
• How do weather forecasters utilize infrared technology?

  They use satellite pictures taken with IR cameras to see cloud and rain patterns more clearly.
• What part of the electromagnetic spectrum can our eyes detect?

  Our eyes can detect visible light.
• What are lasers used for in technology?

  Lasers are used in CD and DVD players, laser printers, and aircraft weapon aiming systems.
• What are some uses of ultraviolet (UV) light?

  UV light is used for tanning, detecting forged bank notes, and hardening dental fillings.
• How can ultraviolet rays benefit the body?

  They cause the body to produce vitamin D, which is used to treat deficiencies and skin disorders.
• What health risks are associated with large doses of UV light?

  They can cause damage to the retina, sunburn, and skin cancer.
• What are X-rays used for in medicine?

  They are used by doctors to see inside people.
• How are X-rays utilized in airport security?

  They are used to see inside luggage.
• What is a unique application of X-rays in astronomy?

  They are used to detect X-rays emitted by objects in the universe using radio telescopes.
• What is the effect of lower energy X-rays?

  They don't pass through tissues as easily and can be used to scan soft areas like the brain.
• What are gamma rays and where do they come from?

  Gamma rays are given off by stars and some radioactive substances.
• What is the significance of gamma rays in cancer treatment?

  They are used to kill cancer cells in a process called radiotherapy.
• What is a risk associated with gamma rays?

  They can cause cell damage and a variety of cancers.
• How do X-rays and gamma rays affect DNA?

  They cause breaks in DNA and mutations in growing tissues.
• Why are unborn babies especially vulnerable to X-rays and gamma rays?

  Because they can cause mutations in growing tissues.
• What does the acronym LASER stand for?

  Light Amplification Stimulated by Emission of Radiation.
• Who is the teacher discussing quarter 2 module 6?

  Mom Deya
• What is the main topic of quarter 2 module 6?

  Mirrors
• What is the essential learning competency for this discussion?

  To predict the characteristics of images formed by mirrors and lenses
• What does the term "characteristics" refer to in this context?

  Orientation, type, and magnification of images
• What concept does this lesson revolve around?

  Reflection
• How is reflection defined?

  As the bouncing of light rays from an object
• What are the two laws of reflection?

  1. Incident ray, normal, and reflected ray lie in the same plane; 2. Angle of incidence equals angle of reflection