1.) Sonar is a device that uses reflected sound waves to measure underwater dept
ID: 1408945 • Letter: 1
Question
1.) Sonar is a device that uses reflected sound waves to measure underwater depths. If a sonar signal has a frequency of 288 Hz and the speed of sound in water is 1.27 × 103 m/s, what is the wavelength of the sonar signal?
a. 365,760 m b. 0.23m c. 4.4
2.) In the dark at late evening, no color is seen because of lack of stimulation of..
a. Rods b. Cornea c. Cones
3.) Green light emitted by excited mercury vapor corresponds to a particular energy transition in the mercury atom. A more energetic transition might emit _____.
a. Yellow light b. Orange light c. Red light d.) Blue light
4.) Which of the following types of electromagnetic waves has the highest energy per photon?
a. Infrared Radiation b. Radio Waves c. X-Rays d. Microwaves
5.) A beam of light passing through a prism has its colors spread out. The phenomenon is known as
a.Dispersion b. Reflection c. Refraction d. Diffraction
6.) The sonar device on a fishing boat uses underwater sound to locate fish. Would you expect sonar to be a longitudinal or a transverse wave?
a. Longitudinal b. Transverse
7.) As the frequency of a wave increases, the period of the wave ___________.
a. Increases b. Decreases c. Remains the same
8.) Which of the following is not a medium which will transmit sound?
a. Gases b. Liquids c. Solids d. Vacuum
9.) Rainbows are due to _____.
a. Reflection from the surface of raindrops b. Refraction through raindrops c. Refraction and reflection by ice crystals
10.) Mirages are mainly caused by..
a. Dispersion of light by the atmosphere. b. refraction of light by the atmosphere. c. diffraction of light by air.
11.) The lowest pitch that the average human can hear has a frequency of 140.0 Hz. If sound with this frequency travels through air with a speed of 331 m/s, what is its period?
a. 140 sec b. 1/140 sec c. 2.36
12.) The most common type of hearing loss in teenagers and young adults is due to..
a. aging b. infection or disease c. loud noise or music
13.) Clear glass, water and air are examples of what kind of material?
a. Mirrors b. Opaque c. Transparent
14.) What part of the electromagnetic spectrum can be seen by humans?
a. Infrared lights b. Visible light c. Ultraviolet Rays
15.) The medium has an index of 2.684. How fast is the light traveling through that medium?
a.1x10^8 m/s b. 3x10^8 m/s c. 2.684 m/s
16.) Light travels through a medium at 2.57 x 10^8 m/s. What is the index of the medium?
a. 3x10^8 b. 0.267 c. 1.17
17.) What is the index of refraction of a refractive medium if the angle of incidence in air is 41 degrees and the angle of refraction is 26 degrees
a. 4.5 b. 6.3 c. 1.5
18.) What is the index of refraction of a refractive medium if the angle of incidence in air is 38degrees and the angle of refraction is 19 degrees
a. 2.6 b. 7.2 c. 1.9
19. If the angle of incidence of light traveling through water, striking crown glass, is 23 degrees, what is the angle of refraction?
a. 60 b. 20 c. 43
20. If the angle of incidence of light traveling through air, striking water, is 410, what is the angle of refraction?
a.16 b. 30 c. 64
Explanation / Answer
1) wavelength = 1.27 × 103/288 = 4.4 m
2) Cornea
3) Blue loght
4) X rays
5) Dispersion
6) Transverse
7) Decreases .
8) Vaccum
9) Refraction and reflection by ice crystals
10) refraction of light by the atmosphere
11) 1/140 sec
12) loud noise or music
13) Transparent
14) Visible light
15) 1x10^8 m/s
16) 1.17
17) 1.5
18) 1.9
19) 20
20) 30
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