8th Grade Science

8th Grade Science - Waves

A wave is any disturbance that transmits ____________ through matter or empty space.
The law of conservation of energy means that waves cannot do any work on anything in its path.
1. True
2. False
All waves transfer energy by repeated _____________.
Which waves below are mechanical waves ?
(Check all that apply.)
1. ocean waves
2. sunlight waves
3. sound waves
4. earthquake waves
5. microwaves
Which waves are examples of transverse waves?
(Check all that apply.)
1. sound waves
2. electromagnetic waves
3. Any wave whose vibrations are perpendicular to the motion of the wave.
4. Any wave where the particles of the medium vibrate back and forth along the path that the wave moves.
The ______________ of a wave is the maximum distance that the particle in a medium vibrates from its rest position when it is disturbed by the wave.
Which definition below is the correct definition for "wavelength" ?
1. the distance between any two crests or compressions next to each other in a wave.
2. the distance between any two troughs or rarefaction next to each other in a wave.
3. the distance from any point on a wave to an identical point on the next wave.
4. Any of the above.
The number of waves produced in a given amount of time is the wave's ________________ .
Which is the formula for calculating wave speed ?
1. λ = v / f
2. v = λ x f
3. f = v / λ
4. v = f x λ
__________ is the bending of a wave as the wave passes from one medium to another at an angle.
1. Reflection
2. Refraction
3. Diffraction
4. Interference
The phenomenon that occurs when two object naturally vibrates at the same frequency is called:
Check the statements below that apply to a sound wave:
(Check all that apply.)
1. A sound wave is a longitudinal wave.
2. A sound wave is a transverse wave.
3. A sound wave can travel through a vacuum.
4. The middle ear increases the size of the vibrations of a sound wave.
The speed of sound through air at 0^o C is about:
1. 5,280 meters per second
2. 1,190 meters per second
3. 331 meters per second
4. 180,000 meters per second
The apparent change in the frequency of a sound caused by the motion of either the listener or the source of the sound is called the _____________ effect.
If you increase the frequency of a sound wave, the pitch will sound:
1. higher
2. lower
3. louder
4. softer
When you turndown the volume on your car radio, the amplitude of the sound waves is:
1. increased
2. decreased
3. does not change
The most common unit used to measure sound loudness is the:
An echo is the result of the ____________ of a sound wave.
During destructive interference, the amplitude of the sound waves is
1. increased
2. decreased
3. not changed
Standing wave is a pattern of vibration that simulates a wave that is:
1. changing frequency
2. moving
3. standing still
A sonic boom is an example of:
1. constructive interference
2. destructive interference
3. neither
A sound that consists of a random mix of frequencies is called:
Which of the following statements about light waves are true?
(Check all that are true.)
1. Light waves are electromagnetic waves
2. Light waves cannot travel through empty space or a vacuum.
3. Light waves consist of changing electric fields and magnetic fields.
4. In a light wave, the electric field is parallel to the magnetic field.
5. In a light wave, the electric field is perpendicular to the magnetic field.
The speed of light is:
1. 300,000 m/sec
2. 180,000 km/sec
3. 180,000 m/sec
4. 300,000 km/sec
Which of the following waves has the highest frequency in the electromagnetic spectrum?
1. radio waves
2. visible light
3. gamma rays
FM radio uses __________ modulation when broadcasting.
______________ light causes sunburn.
The law of reflection states that:
1. the angle if incidence is greater than the angle of reflection.
2. the angle if incidence is less than the angle of reflection.
3. the angle if incidence is equal to the angle of reflection.
4. the angle if incidence plus the angle of reflection is always greater than 180 degrees.
_____________ is the bending of a light wave as the wave passes between two substances in which the speed of the wave differs.
White3 light can be separated into the colors of visible light by passing it through a piece of glass with the shape of a ________.
Matter that does not transmit any light is said to be:
1. transparent
2. translucent
3. opaque
The primary colors of light include:
(Check all that apply.)
1. white
2. red
3. green
4. yellow
5. blue
6. black
To get yellow, combine:
1. blue
2. red
3. white
4. green
_____________ matter transmits light, but it also scatters the light as it passes through the matter.
_____________ is the bending of waves around barriers or through openings.
1. Reflection
2. Refraction
3. Diffraction
4. Absorption