Questions & Answers >10.3.5 Practice: Waves Practice_Physics I. Online High School PHYSICS 101

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10.3.5 Practice: Waves Physics I

Practice Name: Date:

Question 1 (7 points) a. Draw a transverse wave and label the following properties: crest, trough, amplitude, and wavelength. Then draw a longitudinal wave and label the following properties: compression, rarefaction, and wavelength. (3 points)

b. What is the equation for the speed of a wave? Identify each variable. (1 point) Wave speed: v = fλ v wave speed f frequency λ wavelength

c. Fill in the blanks in the following paragraph to correctly describe the behavior of waves. (1 point)

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A wave is a(n) _current______________ that carries ___energy____________ through space. Some waves travel through empty space. Other waves must travel through a material, also known as a __medium_____________. Waves transfer energy but not __matter_____________. d. Match each term to its correct description. (1 point) A. Refraction B. Diffraction C. Reflection D. Constructive interference E. Destructive interference __D___ The superimposition of waves to create a wave with a larger amplitude __E___ The superimposition of waves to create a wave with a smaller amplitude __A___ The bending of a wave as it enters a different medium __B___ The bending of a wave around an obstacle __C__ The bouncing of a wave off a surface e. Give examples of refraction, diffraction, and reflection. (1 point) Reflection: mirror Refraction: glass Diffraction: holograms

Question 2 (4 points) a. What property of sound waves is related to pitch? (1 point) Frequency

b. What property of sound waves is related to volume? (1 point)

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Amplitude

c. What is the Doppler effect? What causes it? (1 point) The change of frequency in waves due to the motion of the source. It occurs when the source by relative motion of the observer and wave source

d. Describe the relative speeds of sound in the different states of matter. (1 point) Travel the slowest through gases , faster through liquids , and fastest through solids

Question 3 (3 points) a. What are two equations for the energy of light? Identify each variable. (1 point) Light energy: h f c

Planck's constant frequency speed of light in vacuum

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b. White light is made up of all colors. If white light shines on an orange, which colors will be reflected and which will be absorbed? (1 point) The orange will reflect the light and absorb all the colors except orange

c. Identify the correct order of the parts of the electromagnetic spectrum by placing numbers in the table. (1 point)

From shortest to longest wavelength

From lowest to highest frequency

Ultraviolet radiation 3

5

Radio waves

7

1

Visible light

4

4

Infrared radiation

5

3

X-rays

2

6

Microwaves

6

2

Gamma rays

1

7

Question 4 (2 points) a. What is the equation used to find the angle of refraction? Identify each variable. (1 point)

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Snell's law: n1 sin(θ1) = n2 sin(θ2) θ angle of refraction

b. A light wave moves from diamond (n = 2.4) into water (n = 1.33) at an angle of 24°. What angle does it have in water? (1 point) n₁ = index of refraction of diamond = 2.4 n₂ = index of refraction of water = 1.33 θ₁ = angle of incidence = 24 deg θ₂ = angle of refraction = ? n₁ Sinθ₁ = n₂ Sinθ₂ (2.4) Sin24 = (1.33) Sinθ₂ θ₂ = 47.22 deg

Question 5 (4 points) a. Fill in the blanks in the following paragraph to identify the properties of mirrors and lenses. (1 point) Lenses produce images through __refraction_____________, but mirrors produce images through _reflection______________. A __convex_____________ mirror and a ___concave____________ lens focus light at a point. A ___convex____________ mirror and a ___concave____________ lens spread light apart. b. Compare the signs of ƒ for lenses and mirrors. (1 point) A positive focal point: concave mirrors and convex lenses A negative focal point: convex mirrors and concave lenses

c. What kind of image is formed when the image distance is positive? What kind of image is formed when the image distance is negative? (1 point)

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When its positive the image is real and on the same side of the mirror When its negative the image is behind the mirror and is inverted

d. Complete the table to review what the sign and value of the magnification tell about the size and orientation of the image formed. (1 point)

Magnification (m) Larger or smaller image?

Upright or inverted image?

+2.0 –2.0 +0.5 –0.5 Question 6 (5 points) a. Describe the three rays that are used to locate images formed by mirrors. (1 point) Ray 1 parallel to the axis, ray 2 strikes the center of the mirror, and ray 3 goes through the focal point

b. Describe the three rays that are used to locate images formed by lenses. (1 point) Ray from the top, Ray from the center, and a ray through the focal point

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c. What is the equation used to find the image distance? Identify each variable. (1 point)

Image distance: di image distance do object distance f frequency

d. An object is located 25.0 cm from a convex mirror. The image distance is – 50.0 cm. What is the magnification? (1 point)

e. Compare nearsightedness and farsightedness with respect to the symptoms and the lenses used to correct them. (1 point) Convex lenses correct farsightedness ; far away objects are not seen clearly Concave lenses correct nearsightedness ; near objects are not seen clearly

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