Download ACUTUS MENS – Semester 2 AM #1 Define wave. A periodic

ACUTUS MENS – Semester 2
AM #1
1. Define wave. A periodic disturbance in a solid, liquid, or gas as energy is transmitted through a
medium.
2. Give 3 examples of media. Solid, Liquid, Gas
3. What 2 things can waves travel through? Matter and Space
4. What does a wave carry? Energy
AM#2
1. What kind of waves require a medium? Electromagnetic Waves
2. What kind of waves do NOT require a medium? Mechanical Waves
3. What do we call waves that are produced by a combination of longitudinal and transverse
waves? Surface Waves
4. What is amplitude? Why is it significant? Height of the wave from the rest point; Larger
amplitude = more energy
5. What is frequency? Why is it significant? The number of waves produced in a given amount of
time; as frequency increases, wavelength decreases and vice versa
AM #3
1. How do we calculate wave speed? Wave speed (γ) = wavelength (λ) X frequency (f)
2. What is the relationship between frequency and wavelength? As frequency increases,
wavelength decreases and vice versa
3. Differentiate between reflection, refraction, and diffraction. Reflection – the bouncing back of a
wave; Refraction – the bending of a wave as it changes medium; Diffraction – bending of a wave
around a corner or through a hole
4. What is interference? Explain the two types of interference. When waves overlap. Constructive
– waves overlap and builds (gets louder or brighter); Destructive – waves overlap and collapse
(dimmer light or creates noise)
5. What is a standing wave? Give an example. Pattern of vibration that stimulates a wave that is
standing still (looks like it is standing still); car wheels spinning while driving
6. Explain resonance. Give an example. When 2 objects naturally vibrate at the same frequency;
sound produced by one causes the other to vibrate; loud radio bass causes mirrors to vibrate
AM#4
1. What kind of wave is a sound wave? Mechanical and Longitudinal
2. How does sound travel? By vibration
3. In what direction do sound waves travel? All directions.
4. Define a medium. An object through which a wave travels (solid, liquid, gas).
AM#5
1. What are the 3 sections of the ear? Outer, Middle, Inner
2. What are the 3 bones in the middle ear called? Hammer, Anvil, Stirrup
3. What is responsible for transmitting sound electrically to the brain? Cochlea
4. Predict what may have happened if a person has lost their hearing (answers will vary).
5. What are the 3 kinds of instruments? Strings, Winds, Percussion
AM #6
1. What is pitch? How is it related to frequency? How low or high a sound seems to be; high pitch =
high frequency and low pitch = low frequency
2. What do we call sounds that have a frequency too high to hear? ultrasonic
3. What happens when a jet breaks the sound barrier? Build up of constructive interference; as the
jet reaches the sound barrier, the constructive waves move quickly to the back of the jet
resulting in rapidly moving particles that create a sound know as a “sonic boom”
4. Describe the Doppler effect . Change in frequency of a wave when the source or observer is in
motion (like severe weather warning sirens).
5. Define noise. Random mix of frequencies (depends on listener).
AM #7
1. Define loudness. What is the unit used to measure loudness? How well a sound can be heard;
decibel
2. How are amplitude and frequency related? High amplitude = high frequency and vice versa
3. What is used to change a longitudinal sound wave into a transverse wave? Oscilloscope
4. What is an echo? Reflected sound wave
5. What surface reflects an echo the best? Flat, smooth surface
AM #8
1. What is an electronic echo called? Radar
2. What do we call the process of using sound to locate an object? echolocation
3. What medical procedure allows us to “see” inside the body without surgery? Ultrasonography
(ultrasound)
4. Define a sonic boom. The crashing of constructive waves built up as a jet passes through the
sound barrier. The particles crash together all at once resulting the very loud sound.
5. What are the 2 kinds of standing waves? Fundamental and resonant frequencies
AM #9
1. Define sound quality. Blending of pitches through interference.
2. Define noise. Random mix of frequencies (depends on listener).
3. What is an electromagnetic wave? A wave that is made of electric and magnetic fields that
vibrate – does not require a medium.
4. Define radiation. Transfer of energy by electromagnetic waves.
5. What is the electromagnetic spectrum? All the frequencies or wavelengths of electromagnetic
radiation; divided based on wavelength
6. List the waves of the electromagnetic spectrum in order from longest to shortest. Radio Waves
– longest; used in radio signals and TV signals; Microwaves – used in microwave ovens , radar,
cell phones, and satellites; Infrared – heat detection, night vision goggles; Visible Light – very
narrow band (the Rainbow – ROYGBIV); Ultraviolet – produced by sun, causes sunburn, kills
bacteria; X-Rays – used in detection of broken bones and security devices; Gamma Rays – used
to kill bacteria on food and in treatment of specific types of cancers.
7. Differentiate between the 2 kinds of reflection. Regular – reflection seen when using a flat,
plane mirror; Diffuse – reflection seen when using a contoured mirror (like a fun house mirror).
AM#10
1. Compare absorption to scattering. Absorption – light particles are absorbed by the object (very
little light is reflected); Scattering – light is largely reflected (like a disco ball)
2. What is refraction? Give an example. Bending of a wave as it changes medium; a light beam
travelling through a piece of paper (gas to solid, then back to gas)
3. Define diffraction. Bending of light around corners or through a hole (under a door, etc.)
4. What are the three things light can do? Reflect, Absorb, and Transmit
5. What are the 3 kinds of objects and how do they relate to light? Opaque – absorbs part of light
and reflects the rest; Transparent – transmits light; Translucent – absorbs part and scatters the
rest.
6. When we look at an object, what color do we see? The color of light that is reflected.
7. What happens to the other colors? They are absorbed.
AM #11
1. What are the three primary colors of light? Red, Blue, and Green
2. When the 3 primary colors of light are combined in equal amounts, what do they create? White
light
3. What is pigment? An opaque substance that reflects and absorbs light.
4. What are the three primary pigment colors? Cyan, Magenta, Yellow
5. When the three primary pigments are added together in equal amounts, what is the result?
Black
6. Compare the primary colors of light to the primary colors of pigments. Light – Red, Green, and
Blue – combine to make white light; Pigments – Cyan, Magenta, Yellow – combine to make black
7. Draw a convex and concave lens/mirror. Concave -
Convex -
AM #12
1. What is a plane mirror? Flat mirror
2. Which type of lens magnifies? convex
3. Which type of lens make images appear fine and crisp? concave
4. What are the 2 most common vision problems? Nearsightedness and farsightedness
5. What is the function of the following parts of the eye: retina, pupil, lens, optic nerve, cornea,
iris? Retina – back of eye, contains rods (black and white) and cones (color); Pupil – black part of
eye where light passes through; Lens – convex lens that refracts light; Optic Nerve – flips image
right side up and sends signals to brain; Cornea – provides shape to the eye; Iris – colored
portion of the eye.
6. Name 3 ways light affects your life (answers will vary). Cameras, Telescopes, Lasers, etc.
AM#13
1. What are the properties of a magnet? Material that attracts ferromagnetic material.
2. What are the opposite ends of a magnet called? poles
3. What is magnetic force? The push or pull exerted by a magnet.
4. Explain how a magnetic field works. The area around a magnet where t he magnetic force is
effective.
5. How can a magnet lose its’ magnetic alignment? (How can you destroy a magnetic field?)
Striking it very hard, dropping from a very high altitude, heating it.
6. How can you create a magnet? Rub a ferromagnetic material on a strong magnet – only
temporary.
7. How is the Earth like a magnet? Has a magnetic field, made of spinning electrons
8. Explain the relationship between north and south poles on a magnet. Like poles repel, opposite
poles attract.
AM#14
1. How does a compass work? Magnetized needle that aligns itself with the magnetic pull of the
Earth (pointing North).
2. What happens when you break a magnet? You get 2 new (less powerful) magnets.
3. Give an example of a magnetic light show. Aurora Borealis (Northern Lights)
4. What is generated when charges flow through a wire? Electric current
5. What is the unit used to express the amount of charge that flows through a wire? Amperes
(amps)
6. What does an electric current produce? What happens if the current reverses? A magnetic field;
the magnetic field reverses as well.
7. What can electrical current flow through? A circuit.
AM #15
1. Define an electric circuit. The closed path through which charges can flow.
2. What are the 3 components to a circuit? Energy source, wires, load.
3. Compare a conductor to an insulator and give an example of each. Conductor moves current
easily – the electrons are loosely bound. Copper is an excellent example. Insulator prevents
current from moving – the electrons are tightly bound. Rubber is an excellent example.
4. What happens when you flip a switch? The circuit closes and the electrons are free to move.
5. What is resistance? The opposition to the flow of a charge.
6. What object is used to help control resistance? Resistor
7. Give an example of how resistance is very useful in our lives. Prevents electrical fires. Your
toaster would blow up with out resistance!
8. Compare a series and a parallel circuit. Use drawings if necessary. Series connects loads in only
one path. Parallel connects to loads on both sides providing multiple paths for current to flow.
AM #16
1. What are the characteristics of a superconductor? No electrical resistance, very efficient,
strongly repels magnets, must be kept very cool.
2. How does an electric motor function? Changes electrical energy into mechanical energy.
3. What is a galvanometer? A device, run by an electromagnet that detects current.
4. What is an armature? A coil or loop in a motor that provides movement for a charge.
5. What is the function of a commutator? Reverses the direction of a charge.
6. How does an electric generator work? Changes mechanical energy to electrical energy.
AM#17
1. What function does a transformer serve? Speed up or slows down current as it flows through
wires.
2. What is ferromagnetic material and how is it used in electromagnets? Material made from iron
or nickel that is highly attracted to magnets. It provides the core to an electromagnet.
3. How does an electromagnet function? Has 2 poles that act like switches; when attached to an
energy source the ferromagnetic material becomes magnetized.
4. What is the coil called that is used in an electromagnet? solenoid
5. How can you increase or decrease the power/strength of an electromagnet? Increase or
Decrease the number of coils in the solenoid or add a stronger/weaker ferromagnetic material.
6. Give an example of an electromagnet. A crane in a junkyard, but all of your technological
devices contain electromagnets.
AM #18
1. What does the law of electric charges state? Like charges repel, opposites attract.
2. How are an electric force and an electric field related? An electric force creates an electric field.
3. Describe 3 ways to charge an object. Give examples. Friction – rubbing balloon on your head
and sticking it to the wall (wiping electrons); Conduction – building up electrons on your feet
and then touching a metal doorknob (charge transfers by direct contact); Induction – charge
happens when an object is exposed to another charge (Van Degraff Generator)
4. What kind of device can detect a charge? Electroscope
5. Explain static electricity and electric discharge. Charge at rest on an object; touching a
conducting object (doorknob) transfers the charge (discharge).
6. In relation to electricity, what does it mean to be grounded? Electric current to transferred to
the ground via wires.
7. Compare AC to DC. AC – Alternating Current – moves in 2 directions; DC - Direct Current –
moves in 1 direction.
AM #19
1. What is voltage and how it related to energy? Voltage is the amount of energy needed to push a
charge through a wire
2. What unit is used to express voltage? volts
3. Why do batteries vary in voltage? The vary in need and size.
4. How does resistance factor in with insulators and conductors? Conductors have low resistance;
Insulators have low resistance.
5. If you wanted maximum voltage what kind of wire would you want? Does temperature play a
part? Thick, short wires in a cool setting is ideal!
6. What does Ohm’s Law state? The ratio of voltage to current is constant and referred to as
Resistance.
7. What unit to we use to measure resistance? An Ohm - Ω
AM #20
1. Define electric power. What unit is used to express electric power? The rate at which electrical
energy is changed into other forms of energy. (Plug in a lamp and it changes into light and
thermal energy).
2. One kilowatt (kW) equals how many watts? 1000
3. Give examples of series and parallel circuits. Series – old Christmas tree lights and burglar
alarms; Parallel – circuitry in a home or building
4. What is a fuse? Small, thin piece of metal that expands and opens a circuit to prevent the flow of
charge.
5. How are circuit breakers used in our homes? To prevent electrical fires; a safety net.