properties of light and sound
What property of light allows you to see your reflection in a mirror?
Reflection
What technology uses light signals to transmit internet data?
Fiber optic cable
What does LED stand for?
Light Emitting Diode
Is it safe to look directly at the Sun?
No.
Which travels faster: light or sound?
Light
What property of light makes a straw appear bent when placed in a glass of water?
Refraction
Which technology uses sound waves to locate underwater objects?
SONAR (Sound Navigation and Ranging)
What technology creates three-dimensional images using light?
Hologram
Why should people avoid listening to music at maximum volume for long periods?
It can damage hearing.
Give one example of a technology that uses light.
Any of the following:
What property of sound causes you to hear your voice again after shouting inside a cave?
Echo (Reflection of sound)
What medical technology uses sound waves to examine a baby inside the mother's womb?
Ultrasound
Name one innovation that reduces unwanted noise.
Soundproofing
Why should lasers be handled carefully?
They can damage the eyes and cause accidents.
Give one example of a technology that uses sound.
Any of the following:
Explain why light can travel through outer space while sound cannot.
Light is an electromagnetic wave and does not need a medium, while sound is a mechanical wave and requires a medium such as air, water, or solids.
Compare how SONAR and RADAR work.
SONAR uses sound waves to detect underwater objects, while RADAR uses radio waves to detect objects in the air or on land.
Why are LEDs replacing ordinary light bulbs?
They use less energy, last longer, produce less heat, and provide brighter light.
A student uses headphones while crossing a busy road. Is this responsible? Explain.
No. Wearing headphones can prevent the student from hearing warning sounds, increasing the risk of accidents.
A doctor uses one technology to perform eye surgery, while another doctor uses a different technology to examine a fetus inside the womb. Identify both technologies and explain why each is appropriate.
Laser is used for eye surgery because it provides a precise beam of light. Ultrasound is used to examine a fetus because sound waves create images of structures inside the body safely.
A rescue team uses flashlights and whistles during emergencies. Which wave can travel through space, and which requires a medium? Explain why both tools are useful.
Light from the flashlight can travel through space because it does not require a medium. Sound from the whistle needs air to travel. Flashlights help people see or signal over distances, while whistles help alert nearby rescuers through sound.
A submarine and an airplane both need to detect nearby objects. Which technology should each use? Explain your answer.
The submarine should use SONAR because sound travels effectively underwater. The airplane should use RADAR because radio waves travel efficiently through the atmosphere.
A new public library is being built beside a busy highway. Recommend one innovation involving light or sound that should be included in the building. Explain why.
Soundproofing should be installed to reduce outside noise and provide a quiet environment for reading and studying.
Your community plans to hold a concert in a residential area until midnight. What recommendations would you give to protect people's health while still allowing the event to continue?
Lower the speaker volume, limit the event duration, follow local noise regulations, and provide hearing protection for workers or performers.
Imagine that all technologies involving light and sound suddenly stopped working for one day. Describe three major effects this would have on people's daily lives.
Possible answers include: