Magnets
What happens when magnets are pulled far apart
Strength of attraction decreases or the magnets seem to get weaker
Area around charged particle
Electric Field
Sound is caused by…
vibrations
List the colors of the visible spectrum in order:
ROYGBIV!
red, orange, yellow, green, blue, indigo, violet
Distance spanned by one cycle
Wavelength
Tightly wound coil that makes magnetic field
Electromagnet
Converts kinetic → electrical energy
generator
Sound is ___ you can hear
Energy
Absorption happens when:
Transfers light to heat energy
How are sound and light waves similar and different?
Similar: Both transfer energy, have wavelength, frequency, and amplitude; both can be reflected and absorbed.
Different: Sound is a mechanical wave — it needs a medium (matter) to travel. Light is an electromagnetic wave — it can travel through a vacuum/empty space. Sound travels much slower than light.
How can magnets exert forces without contact?
Magnets are surrounded by a magnetic field that extends through space. When another magnet enters that field, the fields interact — like poles repel and opposite poles attract — without physical contact.
Rate electric charge passes a point
Electric current
Sound needs a ___ to travel
Medium (solid, liquid, or gas)
All Electromagnetic radiation travels at speed of…
LIGHT!
What is different between digital vs. analog clocks?
Digital is less precise — it's a representation of numbers, while analog is more exact but you need to learn to read clock hands.
How do you increase an electromagnets strength?
Increase voltage → more current → stronger magnet
What makes an electromagnet magnetic?
When electric current flows through a wire, it creates a magnetic field around the wire. Wrapping the wire into a coil concentrates and amplifies that field. The more coils and the more current, the stronger the magnetic field — just like a permanent magnet, but controllable by turning the current on or off.
Speed of sound in a gas, solid, or liquid ordered from fastest to slowest
Solid, liquid, gas
Which electromagnetic waves have the least energy and the most energy?
Radio Waves (least)
Gamma Rays (most)
What organ is used to sense light and what organ is used to sense sound?
Eyes see light and ears hear sound
How could you move the magnet without touching it?
The magnetic field from the magnet under the table passes through the wood (a non-magnetic material) and interacts with the magnetic field of the magnet on top. Wood does not block magnetic fields, so the attractive force pulls the top magnet along as the bottom one moves.
Why do electromagnets form a circuit?
An electromagnet needs a continuous flow of electric current to produce a magnetic field. A circuit provides the closed path that allows current to keep flowing through the wire coil, sustaining the magnetic field. Without a complete circuit, current stops and the magnetic field disappears.
The volume of a sound is the ________ of a wave.
The pitch of a sound is the ______ of a wave.
Amplitude, frequency
Do black or white shirts heat up the least? Justify using light waves.
white. White objects reflect most wavelengths of visible light rather than absorbing them. Since the shirt absorbs the least light energy, it converts the least to heat. Black absorbs nearly all light wavelengths, converting them to thermal energy, which is why it heats up most.
What are some advantages of digital media compared to analog?
Digital format preserves exact data without decay, can be backed up infinitely without quality loss, and is accessible on widely available modern devices — making it a more reliable and future-proof choice than analog tape.