Waves & the EM SpectrumWaves & the EM Spectrum

1. Wave – a transfer of ________1. Wave – a transfer of ________

2. In a wave, molecules pass energy 2. In a wave, molecules pass energy on to ____________ moleculeson to ____________ molecules

3. A material through which a wave 3. A material through which a wave travels is a _________.travels is a _________.

It can be solid, liquid, or gas.It can be solid, liquid, or gas.

4. Do sound waves travel faster 4. Do sound waves travel faster through gases or liquids?through gases or liquids?

5. Try this: Smack your hand down on 5. Try this: Smack your hand down on your desk. It’s pretty loud, huh?your desk. It’s pretty loud, huh?

Now, lay your head down on your desk Now, lay your head down on your desk and smack again. Any louder? and smack again. Any louder?

WHY?WHY?

Not all waves need a medium through Not all waves need a medium through which to travel.which to travel.

6. What is an example of this6. What is an example of this

type of wave?type of wave?

7. Mechanical waves can only travel 7. Mechanical waves can only travel through ________.through ________.

8. Draw a transverse wave8. Draw a transverse wave

9. In a transverse wave, the matter in 9. In a transverse wave, the matter in the medium moves __________ to the the medium moves __________ to the

direction that the wave travels.direction that the wave travels.

10. Draw a longitudinal wave10. Draw a longitudinal wave

11. In a longitudinal wave, matter in 11. In a longitudinal wave, matter in the medium moves ___________ that the medium moves ___________ that

the wave travels.the wave travels.

12. Label the crest, trough, & rest 12. Label the crest, trough, & rest position of the transverse wave.position of the transverse wave.

13. Label the amplitude and 13. Label the amplitude and wavelength of the transverse wave.wavelength of the transverse wave.

14. Label the compression, rarefaction, 14. Label the compression, rarefaction, and wavelength ofand wavelength of

the longitudinal wave.the longitudinal wave.

15. As frequency increases, 15. As frequency increases, wavelength __________.wavelength __________.

16. What is the number of waves16. What is the number of waves

that pass a certain pointthat pass a certain point

in one second called?in one second called?

vs.vs.

17. So the more energy a wave 17. So the more energy a wave carries, the _________carries, the _________

the amplitude.the amplitude.

18. ______ occurs when18. ______ occurs when

a wave strikes an object anda wave strikes an object and

bounces off of it.bounces off of it.

19. ______ is the bending of a wave19. ______ is the bending of a wave

caused by a change in its speed.caused by a change in its speed.

20. ______ is when an object causes20. ______ is when an object causes

a wave to change a wave to change directiondirection

and bend around it.and bend around it.

21. ______ waves are produced by an 21. ______ waves are produced by an oscillating electric charge.oscillating electric charge.

And now,a word from our sponsors. . .

22. As frequency of EM wave 22. As frequency of EM wave decreases, its energy __________.decreases, its energy __________.

23. Which EM waves have23. Which EM waves have

the longest wavelength?the longest wavelength?

MicrowavesMicrowaves

InfraredInfrared

24. What range of the EM spectrum 24. What range of the EM spectrum can we detect with our eyes?can we detect with our eyes?

Visible lightVisible light

UltravioletUltraviolet

X-rayX-ray

GammaGamma

25. Gamma radiation25. Gamma radiation

kills _________.kills _________.

26. Which region of the EM spectrum26. Which region of the EM spectrum

travels the fastest?travels the fastest?

27. Which region of the EM spectrum 27. Which region of the EM spectrum has the highest frequency?has the highest frequency?

28. Which region of the EM spectrum 28. Which region of the EM spectrum has the longest wavelength?has the longest wavelength?

Helpful reminders for the test:Helpful reminders for the test:

Differences b/w experimental variables (Ind, Differences b/w experimental variables (Ind, Dep, Constant, Control)Dep, Constant, Control)

Understand velocity & accelerationUnderstand velocity & acceleration

Newton’s 3 Laws of MotionNewton’s 3 Laws of Motion

Plotting Ind. & Dep. VariablesPlotting Ind. & Dep. Variables

EnergyEnergy

The EndThe End