Questions and answers by

mir

Questions (269)

Which is the lowest frequency?800 MHz 1450 kHz 1000 kHz 216 MHz
1. 1 answer
2. 94 views
The Federal Communications Commission assigns _____ for different organizations to use.frequencies amplitudes radios spectrums
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2. 122 views
Which is not a characteristic of FM radio waves?better sound than AM waves more energy than AM waves greater distance than AM
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2. 130 views
The layer of charged particles that reflects some types of radio waves is called the _____.atmosphere ionosphere stratosphere
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2. 89 views
Which is the lowest frequency?800 MHz 216 MHz 1450 kHz 1000 kHz
1. 1 answer
2. 181 views
Which term refers to the way information is encoded into a radio signal?frequency spectrum modulation amplitude
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2. 119 views
Which type of light source uses a diode to produce light energy?vapor LED incandescent fluorescent
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2. 157 views
Which type of light is often used to illuminate parking lots at night?fluorescent incandescent neon mercury vapor
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2. 118 views
Which type of light source did Thomas Edison develop for everyday use?LED fluorescent neon incandescent
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2. 118 views
Which type of light source is used in TV screens?fluorescent LED neon vapor
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2. 101 views
Which type of light source uses a filament to produce light energy?LED vapor fluorescent incandescent
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2. 124 views
Which of the following light sources produces the greatest variety of colors?A. fluorescent B. incandescent C. vapor D. neon
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2. 124 views
How do you find the speed of an electromagnetic wave?Dvide the frequency by the wavelength. Divide the wavelength by the
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2. 176 views
How do ultraviolet rays (UV) compare to visible light?UV has wavelengths slightly shorter than those of visible light. UV has
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2. 180 views
In electromagnetic waves, how do the magnetic fields relate to the electric fields?They are at 45-degree angles to each other.
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2. 126 views
Which waves have some electrical properties and some magnetic properties?magnoelectric waves electromagnetic waves mechanical
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2. 184 views
Which type of electromagnetic radiation has the highest energy?radio waves microwaves gamma rays X-rays
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2. 140 views
What produces light and all other electromagnetic waves?charged particles heated metals radioactive samples the photoelectric
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2. 130 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
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2. 124 views
Use the diagram to answer the question.In the figure above, which wavelength has the least energy? B E G F
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2. 133 views
Visible light that appears white _____.is the absence of the other colors has the highest energy waves of the electromagnetic
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2. 228 views
What is it called when light shining on certain substances causes an electric current to flow?infrared radiation the
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2. 178 views
What is a packet of light energy called?photon electron wave photoelectron
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2. 108 views
When a police officer uses radar for speed control, the officer is using what kind of electromagnetic waves?radio waves gamma
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2. 132 views
Visible light can be separated into various colors to form a(n) _____.thermogram MRI spectrum X-ray picture
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2. 91 views
Use the diagram to answer the question.In the figure above, which wavelength has the most energy? D F E G
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2. 113 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
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2. 138 views
Where on the electromagnetic spectrum are the wavelengths that form visible light?mostly near the far right throughout the whole
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2. 97 views
Which electromagnetic waves have the longest wavelengths?radio waves gamma rays X-rays visible light
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2. 144 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
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2. 100 views
What type of electromagnetic radiation rays in sunlight can cause sunburn?ultraviolet rays radio waves infrared rays X-rays
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2. 153 views
What happens when the wavelength of electromagnetic waves decreases?the energy decreases the frequency decreases the magnetism
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2. 111 views
Hospitals use _____ to disinfect hospital equipment.gamma rays microwaves ultraviolet rays X-rays
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2. 108 views
Which type of radiation can pass through skin and soft tissue but not through bone tissue?UV rays gamma rays X-rays microwaves
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2. 129 views
Engineers use _____ to check for structural faults in buildings.gamma rays infrared rays X-rays ultraviolet rays
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2. 128 views
Which of the following types of electromagnetic radiation has the least energy?ultraviolet rays gamma rays X-rays
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2. 158 views
Which type of electromagnetic radiation has the most energy?A. X-rays B. ultraviolet rays C. gamma rays D. microwaves
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2. 174 views
Radiation therapy for cancer patients uses _____.A. infrared rays B. ultraviolet rays C. X-rays D. gamma rays
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2. 125 views
Which of the following types of electromagnetic radiation has the greatest energy?radar infrared rays microwaves radio waves
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2. 148 views
Radar uses _____.microwaves that heat moving objects visible light that captures images of moving objects infrared rays that
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2. 150 views
A thermogram uses _____ to take pictures.microwaves infrared rays broadcast waves radar
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2. 95 views
Electromagnetic waves with the longest wavelengths and lowest frequencies are _____.infrared rays radio waves visible light
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2. 148 views
Which color of visible light has the longest wavelength?green violet yellow red
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2. 127 views
Which is not a use of microwaves?A. kill bacteria B. heat food C. measure speed D. phone friends
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2. 135 views
Which type of electromagnetic waves can be used to see objects in darkness?A. light waves B. infrared rays C. microwaves D.
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2. 166 views
Which electromagnetic waves are at opposite ends of the electromagnetic spectrum?radio waves and gamma rays microwaves and gamma
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2. 194 views
On the electromagnetic spectrum, visible light is positioned between _____.microwaves and gamma rays microwaves and X-rays radio
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2. 178 views
Which statement is true?Waves with the shortest wavelengths have the lowest frequencies. Waves with the highest frequencies have
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2. 177 views
Which form of electromagnetic radiation has the longest wavelengths?microwaves infrared rays radio waves visible light
1. 1 answer
2. 206 views
Which has more energy than ultraviolet rays?X-rays infrared rays microwaves broadcast waves
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2. 125 views
Light waves that vibrate in only one direction are _____.photoelectric electrolyzed polarized magnetized
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2. 108 views
What distinguishes electromagnetic waves from other types of waves, such as water waves or sound waves?Electromagnetic waves are
1. 3 answers
2. 488 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
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2. 135 views
A packet of light energy is called _____.an electron a photon a proton an electromagnet
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2. 187 views
An electromagnetic wave consists of _____ that move at the speed of light.vibrating magnetic fields vibrating electric and
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2. 152 views
Which is not true of electromagnetic radiation?A. It travels a hundred times faster than sound. B. It travels through the vacuum
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2. 154 views
Light waves behave____.Disabled A. always like tiny packets of energy Student Selected Incorrect B. mostly like a stream of
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2. 113 views
Why is pitch an important property of music?Pitch measures the loudness of the songs. The energy of the sound waves is the
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2. 198 views
What determines which notes are produced by a wind instrument?the length of the vibrating string the loudness of the sound
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2. 141 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
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2. 125 views
Which is the lowest level of sound that can damage the ears?40 dB 100 dB 10 dB 120 dB
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2. 97 views
What are infrasound waves?sound waves with very high frequencies that are used for echolocation sound waves with frequencies
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2. 240 views
What do scientists use to make sonograms?sonar acoustics infrasound ultrasound
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2. 180 views
What type of musical instrument is a xylophone?woodwind brass percussion stringed
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2. 130 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
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2. 221 views
The frequency of the sound waves produced by a string _____.decreases as the amplitude of the wave decreases increases as the
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2. 95 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. 172 views
any ideas on how to tesch young learners alphabet and prepositions?(they are foreign language learners)
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2. 662 views
more ideas on how to teach young learners colors?they are learning english as a foreign language?any interesting games?maybe to
1. 1 answer
2. 585 views