Which statement is true regarding mechanical and electromagnetic waves?

A mechanical wave requires a medium, but an electromagnetic wave does not

Both types of waves require a medium

Neither type of wave requires a medium

The speed of an electromagnetic wave can be affected by a medium, but the speed of a mechanical wave cannot

The medium through which a mechanical wave passes can be a solid, a liquid, or a gas. Properties of a wave might change when it moves from one medium to another. What happens to the speed of mechanical wave when it moves from a gas to a solid?

It speeds up and then slows down

The diagram below represents the electromagnetic spectrum. What is the relationship between frequency and wavelength for electromagnetic waves?

As frequency increases, wavelength decreases

As frequency increases, wavelength increases

The relationship depends on the speed of the wave

Electromagnetic radiation is energy that travels in waves. Some examples of electromagnetic radiation are visible light, radio waves and x-rays. Which statement is TRUE for all forms of electromagnetic radiation?

All forms of electromagnetic radiation travel at the same speed through a vacuum/space

All forms of electromagnetic radiation have the same frequency

All forms of electromagnetic radiation have the same wavelength

All forms of electromagnetic radiation have the same amount of energy

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. Which is a logical conclusion about these electromagnetic waves?

Their waves can travel without a medium

Their frequency must be very low

Their wavelengths must be very short

How does the Sun transfer energy to Earth?

By the Earth revolving around the sun

In which medium does sound travel the fastest?

The speed is the same in all three mediums

All of the following affect the speed of sound through different substances EXCEPT _______

The temperature of the substance

The compressibility of the substance

Energy flows as heat when there is a difference in temperature between two objects or mediums. The greater the difference, the faster the energy will flow. Energy will flow from an area of higher temperature to an area of lower temperature. Joe is swimming in the cool water of his swimming pool on a hot summer day. Read the following examples and choose the statement with the correct direction of energy flow.

Energy flow from Joe's body to the cool water of the swimming pool

Energy flow from Joe's glass of ice tea to his hand holding the glass

Energy flow from the cool water in the swimming pool to Joe's body

Energy from the air inside of the air conditioned house to the pool deck

Energy flows as heat when there is a difference in temperature between two objects or mediums. The greater the difference, the faster the energy will flow. Energy will flow from an area of higher temperature to an area of lower temperature.Which of the following describes the flow of thermal energy that occurs as a student holds a piece of ice in her hand.

Thermal energy flows from her hand to the ice cube

Thermal energy flows from the ice cube to her hand

Thermal energy flows back and forth between her hand and the ice cube

Thermal energy does not flow between objects at different temperatures

Which direction would the heat flow between these two objects? Ice cube and water

Heat would not flow between these two objects

The Law of Conservation of Energy states that "Energy cannot be created nor destroyed but can change form" An example of this would be the conversation of potential energy to kinetic energy as an object falls to the ground. Skate boarders use this conversation of potential energy to kinetic energy to travel from one side of a half pipe to another. A half pipe is a U-shaped structure which skate boarders ride from one side to the other. If a skate boarder started from the top of a half pipe that was 3 meters from the ground, he would get to the other side but never to the very top. How can this be explained?

Some of the kinetic energy is converted to heat due to friction

Some of the kinetic energy is converted into chemical energy

Some of the potential energy is converted into electrical energy

Some of the potential energy is converted into electricity due to friction

In the diagram below, energy is being converted from one form to another and some energy is being transformed into unusable heat energy. What energy conversions are taking place?

chemcial to electrical to radiant and thermal

chemical to mechanical and thermal

Which is an example of evidence that energy is neither created nor lost during a transformation?

when a driver of car applies the car's brakes, friction heats the brakes

ice does not melt in the hot sun

if you drop a tennis ball, the tennis ball will never stop bouncing

What happens when heat is added to gas in a sealed container?

The motion of the particles does not change

The particles of gas from a pile on the bottom of the container

What can happen when enough heat is added to or removed from a system?

The substances in a system will change state

The motion of the particles does not change

The particles of gas form a pile on the bottom of the container

The law of conservation of energy states that when one form of energy is transformed to another, __________,

no energy is destroyed in the process

energy is destroyed in the process

energy is crated in the process

some amount of energy cannot be accounted for

Which statement describes the direction of heat flow?

heat flows from a warmer object to a cooler object

heart flows between two objects at the same temperture

thermal energy can only be absorbed by cool objects

heat flows from a cooler object to a warmer object

A solid, such as a popsicle, has a definite shape and definite volume. If you add heat to the Popsicle by leaving it in the sun, what happens to it?

the particles in the popsicle speed up and the popsicle not longer has a definite shape.

the particles in the popsicle slow down and the shape changes.

The particles in the popsicle stop moving.

The popsicle's shape and volume remain the same

Which of the following statement is TRUE?

The particles in an object at 40 degrees Celsius are moving faster than particles at 0 degree Celsius

The particles in an object at 40 degrees Celsius are moving slower than particles at 35 degrees Celsius

The particles in an object at 45 degrees Celsius are moving slower than particles at 40 degrees Celsius

The particles in an object at 40 degrees Celsius are moving faster than particles at 100 degrees Celsius

One way to reduce bias in an experiment is to

take numerical measurements of results

ask only girls about a school topic

use descriptive phrases as your data

make sure that the results come out the way you want them

7th Grade Science4 Midterm Review

Authored by Wendy Sewell

Science

6th - 8th Grade

NGSS covered

Used 12+ times

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90 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Jean Paul has investigated the wavelengths of some common types of waves. He has organized his findings in the following data table. Which waves that Jean Paul researched has the highest frequency?

visible light waves

radio waves

x-rays

microwaves

Tags

NGSS.HS-PS4-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram below shows what happens when light energy strikes the surface of a colored glass plate. Which light ray is refracted?

Tags

NGSS.MS-PS4-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram below shows what happens when light energy strikes the surface of a colored glass plate. Which light ray is transmitted and reflected?

Tags

NGSS.MS-PS4-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram below shows what happens when light energy strikes the surface of a colored glass plate. Which light ray is absorbed and reflected

Tags

NGSS.MS-PS4-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram below shows what happens when light energy strikes the surface of a colored glass plate. Which light ray is reflected?

Tags

NGSS.MS-PS4-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following waves require a medium?

Electromagnetic waves

Mechanical waves

Light waves

x-rays

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The ____ of waves can change when the waves move from one medium to another.

Altitude

Amplitude

Speed

Compression

Tags

NGSS.MS-PS4-2

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7th Grade Science4 Midterm Review

Jean Paul has investigated the wavelengths of some common types of waves. He has organized his findings in the following data table. Which waves that Jean Paul researched has the highest frequency?

The diagram below shows what happens when light energy strikes the surface of a colored glass plate. Which light ray is refracted?

The diagram below shows what happens when light energy strikes the surface of a colored glass plate. Which light ray is transmitted and reflected?

The diagram below shows what happens when light energy strikes the surface of a colored glass plate. Which light ray is absorbed and reflected

The diagram below shows what happens when light energy strikes the surface of a colored glass plate. Which light ray is reflected?

Which of the following waves require a medium?

The ____ of waves can change when the waves move from one medium to another.

Waves can ____ when they move from one medium to another.

In a mechanical wave, like those in an earthquake, amplitude is related to the amount of energy the wave carries. Waves with high amplitude carry a lot of energy. The diagram below shows a series of waves. Which wave would cause the biggest earthquake?

Heather puts a straw into a glass of water. She notices that the straw appears to be broken when she looks through the glass and the water from the side. Which term BEST explains why the straw looks like it is broken?

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