TCBOE Science 8 Post 3

When a rope is moved up and down between two people, a wave is formed. The up and down movement of the rope from person to person is most likely used to model how energy is:

• always conserved.

• converted by gravity.

• lost to the environment.

• transferred through a medium.

The volume of a sound depends on the amplitude of the sound waves. The lower the amplitude of a sound wave, the quieter the sound. Which of the following sound waves illustrates the quietest sound?

• 
• 
• 
• 

When the velocity of an ocean wave decreases as it approaches a shore, what happens to the wave?

• Its height increases.

• Its height decreases.

• Its length increases.

• It crests.

A student observes that a ray of light bends where it passes from glass into water. What best explains this phenomenon?

• The properties of a wave change as it travels from one medium into another.

• The energy of a liquid is greater than that of a solid and increases the amount of light in it.

• The mass of a ray of light varies in proportion with the density of its surroundings.

• A wave consumes energy in a solid but produces energy in a liquid.

The diagram shows a light wave passing through the air toward an opaque piece of glass. Which statement best describes what will happen to the wave as it strikes the glass?

• It will refract and bend to the normal.

• It will reflect at an angle perpendicular to the glass.

• It will continue passing through the glass in its original path.

• It will reflect at an angle that is equal to the angle of incidence.

Which of these types of electromagnetic radiation has the lowest frequency?

• Visible Light

• Radio Wave

• Gamma Ray

• X-Ray

The visible colors listed from shortest to longest wavelength are violet, blue, green, yellow, orange, and red. Which of the following accurately compares the frequency of these colors using this information?

• Blue has a higher frequency than violet.

• Blue has a higher frequency than green.

• Orange has a lower frequency than red.

• Violet has a lower frequency than yellow.

In an electric motor, electrical energy is converted into

• mechanical energy.

• chemical energy.

• thermal energy.

• light energy.

Which of the following does not affect the strength of an electromagnet?

• number of times the wire is looped around the core

• size of the object being attracted by the core

• type of material in the core

• amount of material in the core

How is energy transferred when an instant cold pack is put on a muscle injury?

• By conduction from the muscle to the cold pack

• By convection within the muscle tissue

• By radiation from the surrounding environment

• By an endothermic chemical reaction within the muscle