Grade Physical And Earth Sciences Unit Evaluation Physics Homework Help

Part A: Matching 

Match each term with its correct definition.

  1.

the vision you have when the light entering your eye is focused in front of your retina 

a. nearsighted

b. pupil

c. cornea

d. cones

e. farsighted  2. the transparent covering on your eye that causes light rays to bend and converge  3. the part of your eye that absorbs red, blue and green light  4. being able to see distant images clearly but having difficulty in creating a clear focus of close-up objects  5. the part of your eye that adjusts the amount of light that enters your eye

Part B: Multiple Choice

Choose the answer that best completes the statement or answers the question. 

6. Which of type of waves can travel without a medium?

 a. sound
 b. radio
 c. mechanical
 d. transverse

7. The type of waves that pass through a coiled metal spring are called

 a. transverse waves.
 b. electromagnetic waves.
 c. longitudinal waves.
 d. seismic waves.

8. The average speed of sound in water is approximately 1,500 m/s.  If the noise from a boat takes 5.0 seconds to reach an underwater detector, how far away is the boat? (d/s = t)

 a. 0.0033 m
 b. 300 m
 c. 1,505 m
 d. 7,500 m

9. Which of the following produces electromagnetic waves?

 a. direct current
 b. vibrating electric charge
 c. static electric charge
 d. constant electric field

10. The speed of electromagnetic waves is 

 a. different for each frequency in a vacuum.
 b. less in a vacuum than in water.
 c. 300,000 km/s in a vacuum.
 d. faster than the speed of light in a vacuum.

11. Electromagnetic waves

 a. are longitudinal waves.
 b. are transverse waves.
 c. must travel through a medium.
 d. do not interact with matter.

12. If you hear a musical sound from an instrument that is vibrating the air at 200.0 Hz and traveling at 340 m/s, what is the wavelength of that music? (Hint: use the wave speed equation: [img src=”https://mywaycool.nebraska.edu/ishs_course_images/SCIH021059/evals/images/eval03g001.gif” width=”41″ height=”17″ align=”absmiddle”>) 

 a. 1.7 m
 b. 0.59 m
 c. 68,000 m
 d. 0.0050 m

13. When the crest of one wave passes through the trough of another wave, what takes place?

 a. resonance
 b. constructive interference
 c. destructive interference
 d. diffraction

14. To what is the size of the disturbance from a wave related?

 a. frequency
 b. wave speed
 c. amplitude
 d. refraction

15. The number of wavelengths that pass a fixed point each second is the _______ of those waves.

 a. frequency
 b. period
 c. wavelength
 d. amplitude

16. When light strikes an object and bounces off its smooth surface it is called a

 a. refraction.
 b. regular reflection.
 c. diffuse reflection.
 d. mirage.

17. The wavelength of purple light is _____ that of yellow light.

 a. the same as
 b. longer than
 c. shorter than

18. Which part of the electromagnetic spectrum is usually used for communication? 

 a. radio waves
 b. infrared waves
 c. ultraviolet waves
 d. gamma rays

19. In order for you to see a yellow chair, what wavelength(s) of light reflected from the yellow chair does your eye perceive?

 a. red
 b. green
 c. yellow
 d. red and green light

20. If light waves change speed when they pass from one medium into another, the light will be

 a. diffused.
 b. reflected.
 c. refracted.
 d. translucent.

21. The primary light colors are

 a. magenta, cyan and yellow.
 b. red, blue, and green.
 c. yellow, blue, and green.
 d. red, yellow, and cyan.

22. Which type of light uses phosphors to convert ultraviolet radiation to visible light?

 a. incandescent light
 b. fluorescent light
 c. neon light
 d. laser light

23. Which is the purpose of resonance in musical instruments?

 a. to increase the pitch 
 b. to amplify the sound
 c. to decrease the pitch
 d. to create overtones

24. If you pass by a building with a siren sounding, as you move away from the building, the sound of the sirens will be

 a. higher-pitched.
 b. lower-pitched.
 c. the same.

25. Seeing an image in a mirror is a function of what behavior of light?

 a. refraction 
 b. diffraction
 c. reflection
 d. resonance

26. When a wave bends around an object it encounters it is called

 a. interference.
 b. diffraction.
 c. reflection.
 d. refraction.

27. Musicians use the concept of resonance in sound waves.  What causes resonance?

 a. Resonance is the vibration of waves that take place when the angle of incidence matches the angle of reflection.
 b. The resonance of waves takes place when nodes do not align.
 c. Resonance takes place when an object vibrates by absorbing energy at its natural frequencies.
 d. Destructive interference causes resonance.

28. The decibel scale measures

 a. sound intensity.
 b. the number of rarefactions in sound. 
 c. the Doppler effect.
 d. pitch intensity.

29. Humans can generally hear sounds with frequencies ranging from 20.0 to 20,000 Hz. This means that

 a. humans have no difficulty hearing sounds in this range.
 b. humans have difficulty hearing high-pitched sounds above 20,000 Hz.
 c. humans have difficulty hearing low-pitched sounds below 20.0 Hz.
 d. all of these statements about human hearing are true.

30. What determines the pitch of the sound produced in wind and brass instruments?

 a. the length of the vibrating tube of air in the instrument
 b. how tightly the membrane is fastened across the resonator
 c. the tightness of the strings
 d. the shape of the resonator

31. Which of the following types of containers would allow you to clearly see if there were ice cubes inside?

 a. opaque
 b. translucent
 c. transparent
 d. incandescent

32. Which of the following colors is bent the least as it exits a prism?

 a. blue
 b. yellow
 c. green
 d. red

33. What is the main cause of mirages?

 a. Light diffracts through the opening in human eyes.
 b. Light waves are refracted as they pass through air of different densities.
 c. The normally diffuse scattering of light becomes focused due to the index of refraction of the medium.
 d. The temperature changes in the layers of air cause the light to bend around edges of the actual object.

34. In which type of mirror do the reflected images look farther away than they actually are?

 a. plane
 b. concave
 c. convex

35. Which part of the human eye contains light-sensitive cells that convert an image into electrical signals?

 a. cornea
 b. retina
 c. lens
 d. pupil

36. Which of the following describes the chief reason for color blindness?

 a. The cones in the retina are not functioning properly.
 b. The lens of the eye is too convex.
 c. The rods in the retina are not functioning properly.
 d. The distance between the lens and retina is too short.

37. Which of the following lists of electromagnetic waves is in the correct order from lowest to highest frequency?

 a. microwaves, visible light, radio waves
 b. microwaves, radio waves, visible light
 c. visible light, radio waves, microwaves
 d. radio waves, microwaves, visible light

38. What type of waves does a remote control device use to communicate with a television set?

 a. microwaves
 b. radio waves
 c. carrier waves
 d. infrared waves

39. Which type of electromagnetic waves are used by your body to produce vitamin D?

 a. infrared waves
 b. ultraviolet waves
 c. microwaves
 d. visible light rays

40. Ozone in Earth’s upper atmosphere is most helpful in absorbing potentially damaging . 

 a. ultraviolet waves.
 b. infrared waves.
 c. microwaves. d. gamma rays.

41. Which of the following is true for AM radio waves?

 a. The typical frequency range is in the 100 million Hertz range.
 b. Their changing amplitudes produce changes in the electrical field of your radio antenna.
 c. The amplitude of the carrier waves is altered as the station broadcasts.
 d. AM radio waves tend to provide a clearer signal than FM carrier waves.

42. According to your textbook, how many satellites have been launched into orbit around the Earth?

 a. 10 to 50
 b. 50 to 200
 c. 200 to 1,000
 d. over 1,000

Part C: True or False

Choose whether each of the following statements is True or False.

43. Sound waves do not carry energy.

 a. True
 b. False

44. Refraction occurs when a wave strikes an object and bounces off, moving in another direction.

 a. True
 b. False

45. The angle at which light strikes a surface is the same as the angle at which it is reflected.

 a. True
 b. False

46. A three-dimensional photographic image of an object is a hologram.

 a. True
 b. False

47. Both a convex lens and a concave mirror cause light rays to converge and form different types of images, depending on the position of the object relative to the focal point.

 a. True
 b. False

48. Mechanical waves need matter to travel through and they are only transverse waves.

 a. True
 b. False

49. A process called convergence is when two or more waves overlap and combine to form a new wave.

 a. True
 b. False

50. A wave’s velocity can be calculated by dividing its frequency by its wavelength.

 a. True
 b. False

No matter what kind of paper writing service you need, we’ll get it written. Place Your Order Now!
× How can I help you?