mir

Questions and answers by mir

Questions (269)

more ideas on how to teach young learners colors?they are learning english as a foreign language?any interesting games?maybe to
1. 2 answers
2. 518 views
any ideas on how to tesch young learners alphabet and prepositions?(they are foreign language learners)
1. 6 answers
2. 558 views
What is the intensity of a sound wave?the perception of a person about the frequency of a sound wave the number of waves that
1. 1 answer
2. 114 views
The frequency of the sound waves produced by a string _____.decreases as the amplitude of the wave decreases increases as the
1. 1 answer
2. 66 views
Use the diagram to answer the question.In the figure above, what do the arrows that run from B to C represent? signals sent by
1. 1 answer
2. 172 views
What type of musical instrument is a xylophone?woodwind brass percussion stringed
1. 1 answer
2. 88 views
What do scientists use to make sonograms?sonar acoustics infrasound ultrasound
1. 1 answer
2. 155 views
What are infrasound waves?sound waves with very high frequencies that are used for echolocation sound waves with frequencies
1. 1 answer
2. 182 views
Which is the lowest level of sound that can damage the ears?40 dB 100 dB 10 dB 120 dB
1. 1 answer
2. 77 views
What is a sonogram?a map of the ocean floor a picture of the inside of the human body a record of the communication of dolphins
1. 3 answers
2. 95 views
What determines which notes are produced by a wind instrument?the length of the vibrating string the loudness of the sound
1. 3 answers
2. 94 views
Why is pitch an important property of music?Pitch measures the loudness of the songs. The energy of the sound waves is the
1. 1 answer
2. 140 views
Light waves behave____.Disabled A. always like tiny packets of energy Student Selected Incorrect B. mostly like a stream of
1. 1 answer
2. 82 views
Which is not true of electromagnetic radiation?A. It travels a hundred times faster than sound. B. It travels through the vacuum
1. 1 answer
2. 117 views
An electromagnetic wave consists of _____ that move at the speed of light.vibrating magnetic fields vibrating electric and
1. 1 answer
2. 106 views
A packet of light energy is called _____.an electron a photon a proton an electromagnet
1. 1 answer
2. 158 views
The speed of light is _____ than the speed of sound.about 1,000 times faster about 10 times faster about 100 times faster about
1. 1 answer
2. 95 views
What distinguishes electromagnetic waves from other types of waves, such as water waves or sound waves?Electromagnetic waves are
1. 4 answers
2. 399 views
Light waves that vibrate in only one direction are _____.photoelectric electrolyzed polarized magnetized
1. 1 answer
2. 85 views
Which has more energy than ultraviolet rays?X-rays infrared rays microwaves broadcast waves
1. 1 answer
2. 93 views
Which form of electromagnetic radiation has the longest wavelengths?microwaves infrared rays radio waves visible light
1. 1 answer
2. 167 views
Which statement is true?Waves with the shortest wavelengths have the lowest frequencies. Waves with the highest frequencies have
1. 1 answer
2. 111 views
On the electromagnetic spectrum, visible light is positioned between _____.microwaves and gamma rays microwaves and X-rays radio
1. 1 answer
2. 129 views
Which electromagnetic waves are at opposite ends of the electromagnetic spectrum?radio waves and gamma rays microwaves and gamma
1. 1 answer
2. 129 views
Which type of electromagnetic waves can be used to see objects in darkness?A. light waves B. infrared rays C. microwaves D.
1. 1 answer
2. 139 views
Which is not a use of microwaves?A. kill bacteria B. heat food C. measure speed D. phone friends
1. 1 answer
2. 98 views
Which color of visible light has the longest wavelength?green violet yellow red
1. 1 answer
2. 98 views
Electromagnetic waves with the longest wavelengths and lowest frequencies are _____.infrared rays radio waves visible light
1. 1 answer
2. 105 views
A thermogram uses _____ to take pictures.microwaves infrared rays broadcast waves radar
1. 1 answer
2. 70 views
Radar uses _____.microwaves that heat moving objects visible light that captures images of moving objects infrared rays that
1. 1 answer
2. 106 views
Which of the following types of electromagnetic radiation has the greatest energy?radar infrared rays microwaves radio waves
1. 1 answer
2. 121 views
Radiation therapy for cancer patients uses _____.A. infrared rays B. ultraviolet rays C. X-rays D. gamma rays
1. 1 answer
2. 92 views
Which type of electromagnetic radiation has the most energy?A. X-rays B. ultraviolet rays C. gamma rays D. microwaves
1. 1 answer
2. 132 views
Which of the following types of electromagnetic radiation has the least energy?ultraviolet rays gamma rays X-rays
1. 1 answer
2. 114 views
Engineers use _____ to check for structural faults in buildings.gamma rays infrared rays X-rays ultraviolet rays
1. 1 answer
2. 100 views
Which type of radiation can pass through skin and soft tissue but not through bone tissue?UV rays gamma rays X-rays microwaves
1. 1 answer
2. 91 views
Hospitals use _____ to disinfect hospital equipment.gamma rays microwaves ultraviolet rays X-rays
1. 1 answer
2. 78 views
What happens when the wavelength of electromagnetic waves decreases?the energy decreases the frequency decreases the magnetism
1. 1 answer
2. 71 views
What type of electromagnetic radiation rays in sunlight can cause sunburn?ultraviolet rays radio waves infrared rays X-rays
1. 1 answer
2. 110 views
What can X-rays be used for?to kill bacteria on hospital equipment to stimulate human skin to produce vitamin D to make images
1. 1 answer
2. 76 views
Which electromagnetic waves have the longest wavelengths?radio waves gamma rays X-rays visible light
1. 1 answer
2. 100 views
Where on the electromagnetic spectrum are the wavelengths that form visible light?mostly near the far right throughout the whole
1. 1 answer
2. 70 views
If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency?1 × 10-3 cycles per
1. 1 answer
2. 87 views
Use the diagram to answer the question.In the figure above, which wavelength has the most energy? D F E G
1. 1 answer
2. 89 views
Visible light can be separated into various colors to form a(n) _____.thermogram MRI spectrum X-ray picture
1. 1 answer
2. 70 views
When a police officer uses radar for speed control, the officer is using what kind of electromagnetic waves?radio waves gamma
1. 2 answers
2. 102 views
What is a packet of light energy called?photon electron wave photoelectron
1. 1 answer
2. 77 views
What is it called when light shining on certain substances causes an electric current to flow?infrared radiation the
1. 1 answer
2. 131 views
Visible light that appears white _____.is the absence of the other colors has the highest energy waves of the electromagnetic
1. 1 answer
2. 183 views
Use the diagram to answer the question.In the figure above, which wavelength has the least energy? B E G F
1. 1 answer
2. 107 views
How do scientists use infrared cameras in satellites?to study the growth of plants to count the number of fish in the ocean to
1. 1 answer
2. 91 views
What produces light and all other electromagnetic waves?charged particles heated metals radioactive samples the photoelectric
1. 1 answer
2. 91 views
Which type of electromagnetic radiation has the highest energy?radio waves microwaves gamma rays X-rays
1. 1 answer
2. 108 views
Which waves have some electrical properties and some magnetic properties?magnoelectric waves electromagnetic waves mechanical
1. 1 answer
2. 139 views
In electromagnetic waves, how do the magnetic fields relate to the electric fields?They are at 45-degree angles to each other.
1. 1 answer
2. 97 views
How do ultraviolet rays (UV) compare to visible light?UV has wavelengths slightly shorter than those of visible light. UV has
1. 1 answer
2. 139 views
How do you find the speed of an electromagnetic wave?Dvide the frequency by the wavelength. Divide the wavelength by the
1. 1 answer
2. 114 views
Which of the following light sources produces the greatest variety of colors?A. fluorescent B. incandescent C. vapor D. neon
1. 1 answer
2. 82 views
Which type of light source uses a filament to produce light energy?LED vapor fluorescent incandescent
1. 1 answer
2. 92 views
Which type of light source is used in TV screens?fluorescent LED neon vapor
1. 1 answer
2. 71 views
Which type of light source did Thomas Edison develop for everyday use?LED fluorescent neon incandescent
1. 1 answer
2. 86 views
Which type of light is often used to illuminate parking lots at night?fluorescent incandescent neon mercury vapor
1. 1 answer
2. 85 views
Which type of light source uses a diode to produce light energy?vapor LED incandescent fluorescent
1. 1 answer
2. 120 views
Which term refers to the way information is encoded into a radio signal?frequency spectrum modulation amplitude
1. 1 answer
2. 88 views
Which is the lowest frequency?800 MHz 216 MHz 1450 kHz 1000 kHz
1. 1 answer
2. 154 views
The layer of charged particles that reflects some types of radio waves is called the _____.atmosphere ionosphere stratosphere
1. 1 answer
2. 66 views
Which is not a characteristic of FM radio waves?better sound than AM waves more energy than AM waves greater distance than AM
1. 1 answer
2. 91 views
The Federal Communications Commission assigns _____ for different organizations to use.frequencies amplitudes radios spectrums
1. 1 answer
2. 94 views
Which is the lowest frequency?800 MHz 1450 kHz 1000 kHz 216 MHz
1. 1 answer
2. 66 views
The layer of charged particles that reflects some types of radio waves is called the _____.troposphere stratosphere atmosphere
1. 1 answer
2. 71 views
The Federal Communications Commission assigns _____ for different organizations to use.frequencies radios spectrums amplitudes
1. 1 answer
2. 83 views
Which term refers to the way information is encoded into a radio signal?modulation frequency amplitude spectrum
1. 4 answers
2. 74 views
Satellites are not typically used for _____ signals.cell phone global positioning FM AM
1. 1 answer
2. 77 views
The first GPS was designed for use by _____.communications companies military services ships at sea commercial pilots
1. 1 answer
2. 69 views
You call your friend who lives in a different state. Your cell phone signal goes _____.to a hub near you to a tower and then to
1. 1 answer
2. 96 views
The Global Positioning System used by aircraft requires information from _____ satellites.2 6 3 4
1. 1 answer
2. 81 views
Cell phones use _____.high-frequency microwaves Ultra High Frequency (UHF) waves AM radio waves FM radio waves
1. 3 answers
2. 118 views
The first GPS was designed for use by _____.military services ships at sea commercial pilots communications companies
1. 1 answer
2. 61 views
Satellites are not typically used for _____ signals.AM FM cell phone global positioning
1. 1 answer
2. 90 views
Most of the energy of an incandescent bulb is given off as _____.electricity infrared rays ultraviolet light visible light
1. 1 answer
2. 79 views
What kind of waves do cellular telephones use to transmit and receive signals?gamma rays microwaves infrared rays ultraviolet
1. 1 answer
2. 80 views
What is a neon light used for?to read X-ray negatives to see the inside of patients’ throats in operating rooms and hospitals
1. 1 answer
2. 71 views
How can broadcasting stations send their signals around the world?using X-rays using TV satellites using the Global Positioning
1. 1 answer
2. 76 views
Why is the ionosphere important to radio wave transmission?Both FM and AM waves reflect off it. FM waves reflect off it, but AM
1. 1 answer
2. 82 views
How do neon lights work?a solid is heated with electricity UV light causes powder to glow electric discharges through gases a
1. 1 answer
2. 75 views
How do television signals reach your TV, even though there is not a continuous wire running from the TV broadcast to your home?t
1. 1 answer
2. 76 views
Cell phone signals are transmitted by _____ waves.ultraviolet X-ray radio infrared
1. 1 answer
2. 62 views
Which type of radio broadcast has a greater broadcast range, AM or FM?AM because it reflects off the ionosphere AM because it
1. 1 answer
2. 80 views
Which bulbs requires the most energy to produce the same amount of visible light?incandescent vapor lights tungsten-halogen
1. 1 answer
2. 82 views
Use the diagram to answer the question.In the figure above, where does the signal start and end? The signal starts at A and ends
1. 1 answer
2. 98 views
What do cell phones require to work?high-frequency microwaves ultraviolet rays satellites tuned to their wavelength the Global
1. 1 answer
2. 73 views
What is one drawback to using tungsten-halogen bulbs?They give off a significant amount of heat. They are filled with tungsten
1. 1 answer
2. 85 views
In AM radio, what do the letters “A” and “M” stand for?altitude modification amplitude merging amorphous modulation
1. 1 answer
2. 77 views
What is the frequency of something vibrating 1 million times per second?1 kilohertz 1 hertz 1 megahertz 10 hertz
1. 1 answer
2. 101 views
On AM broadcasts, what remains constant?the distance the frequency the music the amplitude
1. 1 answer
2. 44 views
Most of the energy of an incandescent bulb is given off as _____.electricity ultraviolet light infrared rays visible light
1. 1 answer
2. 76 views
What is a neon light used for?to read X-ray negatives in operating rooms and hospitals in advertising signs and decoration to
1. 1 answer
2. 69 views
What do cell phones require to work?high-frequency microwaves the Global Positioning System satellites tuned to their wavelength
1. 1 answer
2. 72 views
Why is the ionosphere important to radio wave transmission?Both FM and AM waves reflect off it. AM waves reflect off it, but FM
1. 1 answer
2. 83 views
Which type of material scatters light as it passes through?Opaque Transparent Translucent
1. 1 answer
2. 83 views