Help this is a test 16. The speed of sound usually travels in solids because .
A. faster; the molecules are closer together
B. slower; the molecules are closer together
C. faster; the molecules are farther apart
D. slower; the molecules are farther apart

17. In a longitudinal wave, where are the particles most spread out?
A. compression
B. crest
C. rarefaction
D. trough

18. Which is transferred by a radio wave?
A. air
B. energy
C. matter
D. space

19. Which of the following correctly describes refraction:
A. Light is transferred to energy.
B. Light bounces off an object or surface.
C. Waves bend around a barrier or object.
D. Waves bend as they move from one medium to another.

20. Which type of electromagnetic waves are used in tv remotes?
A. radio waves
B. micro waves
C. ultraviolet rays
D. infrared rays

21. In which medium is the speed of a sound wave the greatest?
A. air in your classroom
B. iron railroad track
C. pool of water
D. vacuum in space

22. In the image below, which part does the arrow point to?

A. wavelength
B. crest
C. trough
D. amplitude

23. Which wave can travel in both empty space and matter?
A. radio waves
B. sound waves
C. seismic waves
D. ocean waves

24. Which is an example of diffraction?
A. a flashlight beam hitting a mirror
B. a sunbeam striking a window
C. a water wave going around a large rock
D. a rainbow forming after a rain

25. Would changing the amplitude of a transverse wave change its wavelength? Why or why not?
A. Yes, because amplitude and wavelength are directly related so an increase in one would cause an increase in the other.
B. Yes, because amplitude and wavelength are inversely related so an increase in one would cause a decrease in the other.
C. No, because amplitude and wavelength are not related to one another and therefore changing one does not affect the other at all.
D. No, because amplitude and wavelength are the same thing.

26. Which is strong enough to kill harmful bacteria in food?
A. radio waves
B. microwaves
C. gamma rays
D. infrared rays

27. Which has a longer wavelength than that of blue light?
A. gamma rays
B. radio waves
C. x-rays
D. ultraviolet rays

28. Which wavelength in the visible light spectrum carries more energy?
A. red
B. green
C. violet
D. blue

29. Which is used in doctor’s offices and airports?
A. gamma rays
B. radio waves
C. ultraviolet rays
D. x-rays

30. Which wave carries more energy?
A. x-rays
B. microwaves
C. ultraviolet rays
D. visible light rays