IA3 Waves and Energy

A sound wave passes from air into water and then into steel. With each change in medium, what happens to the speed of the wave?

• It increases, then decreases.

• It increases.

• It decreases.

• It decreases, then increases.

What energy conversions take place during these activities? Riding uphill, the boy's work is converted into

• magnetic energy; riding on level ground, his work is converted into thermal energy.

• thermal energy; riding on level ground, his work is converted into potential energy.

• potential energy; riding on level ground, his work is converted into kinetic energy.

• kinetic energy; riding on level ground, his work is converted into magnetic energy.

The picture below shows a roller coaster car at two positions on the track. Which would be evidence of the conservation of energy?

• The energy of the car at X is half the energy of the car at Y.

• The energy of the car at X is twice the energy of the car at Y.

• The energy of the car at X is the same as the energy of the car at Y.

• The energy of the car at X is destroyed by the time the car reaches Y.

A scientist wants to identify a wave as mechanical or electromagnetic. Which medium should the wave be sent through to identify it?

• air

• glass

• metal

• vacuum

How do the sound waves of the higher-pitched notes compare to the sound waves of the lower-pitched notes?

• The sound waves of notes with higher pitches have lower amplitudes.

• The sound waves of notes with higher pitches travel at slower speeds.

• The sound waves of notes with higher pitches have higher frequencies.

• The sound waves of notes with higher pitches have higher wavelengths.

Which statement is correct regarding the relationship between amplitude and energy of a wave?

• The wave of greater amplitude has less energy.

• The wave of greater amplitude has equal energy.

• The wave of greater amplitude has greater energy

If Janie puts her hand on a cold metal doorknob, how will thermal energy move?

• Cold moves from the doorknob to her hand.

• Heat moves from her hand to the doorknob.

• Heat moves from the doorknob to her hand.

• Cold moves from her hand to the doorknob.

If Bella makes a line graph showing the relationship between kinetic energy and mass at a constant velocity, how does the line look?

• It looks like an S-curve.

• It looks like a horizontal line.

• It looks like a straight line slanting upwards.

• It looks like a straight line slanting downwards.

Which property of the sound wave changes when the volume is increased on a radio?

• period

• frequency

• amplitude

• wavelength

Roseanne heated a solution in a beaker as part of a laboratory experiment on energy transfer. After a while, she noticed the liquid solution begin to circulate within the beaker. What process involving heat transfer did Roseanne observe inside the beaker?

• conduction

• convection

• transduction

• transformation