Question

1. what is true about particles in an elastic medium?

(8.1)
(a) they are typically less effective at transferring waves than fluid media.
(b) they are caused by a disturbance to the medium.
(c) they return to their original location after a wave passes through.
(d) none of the above

1. which of the following are types of waves? (8.2)

(a) transverse and longitudinal
(b) latitudinal and longitudinal
(c) transverse and latitudinal
(d) latitudinal and sound

1. vibrations through a gas produce regions where particles are farther apart. what are these regions called? (8.2)

(a) compressions
(b) rarefied
(c) complex waves
(d) rarefactions

1. which of the following are geometric wave characteristics? (8.3)

(a) waveform, amplitude, and phase shift
(b) amplitude, crest, and trough
(c) crest, trough, and frequency
(d) period, speed, and frequency

1. wave speed is a function of

(a) frequency and wavelength
(b) temperature and density
(c) frequency and amplitude
(d) wavelength and amplitude (8.3, 8.4)

Explanation:

Question 1

• Option (a): Elastic media (like solids) are more effective at transferring waves than fluid media, so (a) is false.
• Option (b): Particles in the medium are not "caused" by a disturbance; the disturbance causes the wave, and particles oscillate. So (b) is false.
• Option (c): In an elastic medium, particles oscillate around their equilibrium (original) position and return there after the wave passes. This is true.
• Option (d): Since (c) is true, (d) is false.

• The main types of mechanical waves are transverse (oscillations perpendicular to wave direction) and longitudinal (oscillations parallel to wave direction).
• "Latitudinal" is not a standard wave type, and sound is a longitudinal wave (not a type category like transverse/longitudinal). So (a) is correct.

• In a longitudinal wave (like sound in gas), regions where particles are closer together are compressions, and regions where they are farther apart are rarefactions.
• "Rarefied" is an adjective, "rarefactions" is the noun for the regions. So (d) is correct.

Answer:

(c) They return to their original location after a wave passes through.

Question 2