SHET
Sound waves are under which type of waves?
A. Mechanical Waves
B. Seismic Waves
C. Electromagnetic Waves
A. Mechanical Waves
TRUE OR FALSE:
Light wave is a form of electromagnetic wave.
TRUE
TRUE OR FALSE:
Sound waves do not need a medium to travel.
FALSE
Which is NOT a characteristic of light?
A. Travels very fast
B. Needs a medium
C. Can be reflected/refracted
B. Needs a medium
What phenomenon happens when light bounces off a surface?
Reflection
What phenomenon describes how high or how low a sound is?
Pitch
What phenomenon describes the bending of light as it passes through different materials?
Refraction
What is produced when sound reflects back after hitting a surface?
Echo
Which application of light waves travels through thin glass fibers and information moves rapidly through pulses of light?
Fiber Optics
Which application of sound waves are used in ships and submarines to detect underwater objects?
Sound Navigation and Ranging (SONAR)
Which application of light waves are used in traffic lights, television screens, smartphone flashlights and digital billboards?
Light Emitting Diodes (LED)
Which application of light waves uses satellite signals to determine location?
Global Positioning System (GPS)
Write one advantage of LED technology.
✔ Energy-efficient
✔ Long-lasting
✔ Brighter than ordinary bulbs
✔ Produces less heat
Write one advantage of LASER technology.
✔ Highly accurate
✔ Powerful light beam
✔ Useful in medicine and industry
Write one advantage of holograms.
✔ Creates realistic visual displays
✔ Improves presentation and entertainment
✔ Enhances security features
Write one advantage of soundproofing technology.
✔ Reduces distractions
✔ Improves sound quality
✔ Protects hearing and privacy
Explain why eye strain is a risk associated with light technology.
Prolonged exposure to screens may cause headaches, eye fatigue, and blurred vision.
Explain why noise pollution is a risk associated with sound technology.
They may come from traffic, factories, loud concerts and construction sites.
It can result to hearing loss, stress and sleep disturbances
Hearing Damage can result from excessive headphone use, loud music and long exposure to noise.
Explain why LASER hazard is a risk associated with light technology.
Improper laser use may damage eyes and cause accidents.
Give at least 2 ways (1 each) to show responsible use of light and sound technology.
For Light Technologies
•Avoid directing lasers at people.
•Limit screen time.
•Use energy-efficient lighting.
For Sound Technologies
•Follow safe listening levels.
•Respect community noise regulations.
•Use sound systems responsibly.