Answers by visitors named: mir

more ideas on how to teach young learners colors?they are learning english as a foreign language?any interesting games?maybe to do flashcards?ideas?

16 years ago

any ideas on how to tesch young learners alphabet and prepositions?(they are foreign language learners)

16 years ago

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 pass by a point per unit time the distance in metric units that a sound wave moves per unit time the energy a sound wave carries...

2 years ago

The frequency of the sound waves produced by a string _____. decreases as the amplitude of the wave decreases increases as the tension of the string increases increases as the tension of the string decreases increases as the amplitude of the wave decrease...

2 years ago

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 radio waves from the ship ultrasonic sound waves reflected back to the ship ultrasonic sound waves sent out from the ship signa...

2 years ago

What type of musical instrument is a xylophone? woodwind brass percussion stringed

2 years ago

What do scientists use to make sonograms? sonar acoustics infrasound ultrasound

2 years ago

What are infrasound waves? sound waves with very high frequencies that are used for echolocation sound waves with frequencies above the normal human range of hearing sound waves with frequencies within the normal human range of hearing sound waves with fr...

2 years ago

Which is the lowest level of sound that can damage the ears? 40 dB 100 dB 10 dB 120 dB

2 years ago

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 a diagram of the navigation of a bat

2 years ago

What determines which notes are produced by a wind instrument? the length of the vibrating string the loudness of the sound produced the length of the vibrating air column the intensity of the sound produced

2 years ago

Why is pitch an important property of music? Pitch measures the loudness of the songs. The energy of the sound waves is the pitch. Music uses specific pitches called notes. The pitch determines the rhythm of the music.

2 years ago

Light waves behave____. Disabled A. always like tiny packets of energy Student Selected Incorrect B. mostly like a stream of particles Disabled C. mostly like transverse waves on a rope Disabled D. like waves and like energetic particles

2 years ago

Which is not true of electromagnetic radiation? A. It travels a hundred times faster than sound. B. It travels through the vacuum of empty space. C. It behaves like a stream of energetic particles. D. It behaves like multiple transverse waves.

2 years ago

An electromagnetic wave consists of _____ that move at the speed of light. vibrating magnetic fields vibrating electric and magnetic fields magnetized particles called photons vibrating electric fields

2 years ago

A packet of light energy is called _____. an electron a photon a proton an electromagnet

2 years ago

The speed of light is _____ than the speed of sound. about 1,000 times faster about 10 times faster about 100 times faster about 1,000,000 times faster

2 years ago

What distinguishes electromagnetic waves from other types of waves, such as water waves or sound waves? Electromagnetic waves are transverse waves. Electromagnetic waves are longitudinal waves. Electromagnetic waves can transfer energy through a vacuum. E...

2 years ago

Light waves that vibrate in only one direction are _____. photoelectric electrolyzed polarized magnetized

2 years ago

Which has more energy than ultraviolet rays? X-rays infrared rays microwaves broadcast waves

2 years ago

Which form of electromagnetic radiation has the longest wavelengths? microwaves infrared rays radio waves visible light

2 years ago

Which statement is true? Waves with the shortest wavelengths have the lowest frequencies. Waves with the highest frequencies have the longest wavelengths. Waves with the longest wavelengths have the most energy. Waves with the longest wavelengths have the...

2 years ago

On the electromagnetic spectrum, visible light is positioned between _____. microwaves and gamma rays microwaves and X-rays radio waves and microwaves infrared rays and ultraviolet rays

2 years ago

Which electromagnetic waves are at opposite ends of the electromagnetic spectrum? radio waves and gamma rays microwaves and gamma rays microwaves and X-rays infrared rays and ultraviolet rays

2 years ago

Which type of electromagnetic waves can be used to see objects in darkness? A. light waves B. infrared rays C. microwaves D. broadcast waves

2 years ago

Which is not a use of microwaves? A. kill bacteria B. heat food C. measure speed D. phone friends

2 years ago

Which color of visible light has the longest wavelength? green violet yellow red

2 years ago

Electromagnetic waves with the longest wavelengths and lowest frequencies are _____. infrared rays radio waves visible light microwaves

2 years ago

A thermogram uses _____ to take pictures. microwaves infrared rays broadcast waves radar

2 years ago

Radar uses _____. microwaves that heat moving objects visible light that captures images of moving objects infrared rays that sense the heat of moving objects radio waves that reflect off moving objects

2 years ago

Which of the following types of electromagnetic radiation has the greatest energy? radar infrared rays microwaves radio waves

2 years ago

Radiation therapy for cancer patients uses _____. A. infrared rays B. ultraviolet rays C. X-rays D. gamma rays

2 years ago

Which type of electromagnetic radiation has the most energy? A. X-rays B. ultraviolet rays C. gamma rays D. microwaves

2 years ago

Which of the following types of electromagnetic radiation has the least energy? ultraviolet rays gamma rays X-rays

2 years ago

Engineers use _____ to check for structural faults in buildings. gamma rays infrared rays X-rays ultraviolet rays

2 years ago

Which type of radiation can pass through skin and soft tissue but not through bone tissue? UV rays gamma rays X-rays microwaves

2 years ago

Hospitals use _____ to disinfect hospital equipment. gamma rays microwaves ultraviolet rays X-rays

2 years ago

What happens when the wavelength of electromagnetic waves decreases? the energy decreases the frequency decreases the magnetism increases the frequency increases

2 years ago

What type of electromagnetic radiation rays in sunlight can cause sunburn? ultraviolet rays radio waves infrared rays X-rays

2 years ago

What can X-rays be used for? to kill bacteria on hospital equipment to stimulate human skin to produce vitamin D to make images of bones inside the human body to broadcast television signals

2 years ago

Which electromagnetic waves have the longest wavelengths? radio waves gamma rays X-rays visible light

2 years ago

Where on the electromagnetic spectrum are the wavelengths that form visible light? mostly near the far right throughout the whole range around the middle mostly near the far left

2 years ago

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 second (Hz) 10,000,000 cycles per second (Hz) 1,000 cycles per second (Hz) 100,000 cycles per second (Hz)

2 years ago

Use the diagram to answer the question. In the figure above, which wavelength has the most energy? D F E G

2 years ago

Visible light can be separated into various colors to form a(n) _____. thermogram MRI spectrum X-ray picture

2 years ago

When a police officer uses radar for speed control, the officer is using what kind of electromagnetic waves? radio waves gamma rays X-rays ultraviolet rays

2 years ago

What is a packet of light energy called? photon electron wave photoelectron

2 years ago

What is it called when light shining on certain substances causes an electric current to flow? infrared radiation the photoelectric effect the Einstein conclusion the polarized light phenomena

2 years ago

Visible light that appears white _____. is the absence of the other colors has the highest energy waves of the electromagnetic spectrum is a mixture of many colors has the lowest energy waves of the electromagnetic spectrum

2 years ago

How do scientists use infrared cameras in satellites? to study the growth of plants to count the number of fish in the ocean to protect whales while they are breeding to warm polar regions of Earth

2 years ago

What produces light and all other electromagnetic waves? charged particles heated metals radioactive samples the photoelectric phenomena

2 years ago

Which type of electromagnetic radiation has the highest energy? radio waves microwaves gamma rays X-rays

2 years ago

Which waves have some electrical properties and some magnetic properties? magnoelectric waves electromagnetic waves mechanical waves transverse waves

2 years ago

In electromagnetic waves, how do the magnetic fields relate to the electric fields? They are at 45-degree angles to each other. They are at right angles to each other. They align along the same radius. They travel in opposite directions.

2 years ago

How do ultraviolet rays (UV) compare to visible light? UV has wavelengths slightly shorter than those of visible light. UV has wavelengths slightly longer than those of visible light. UV has the same energy as visible light. UV has less energy than waves...

2 years ago

How do you find the speed of an electromagnetic wave? Dvide the frequency by the wavelength. Divide the wavelength by the frequency. Multiply the wavelength by the frequency. Add the wavelength plus the frequency.

2 years ago

Which of the following light sources produces the greatest variety of colors? A. fluorescent B. incandescent C. vapor D. neon

2 years ago

Which type of light source uses a filament to produce light energy? LED vapor fluorescent incandescent

2 years ago

Which type of light source is used in TV screens? fluorescent LED neon vapor

2 years ago

Which type of light source did Thomas Edison develop for everyday use? LED fluorescent neon incandescent

2 years ago

Which type of light is often used to illuminate parking lots at night? fluorescent incandescent neon mercury vapor

2 years ago

Which type of light source uses a diode to produce light energy? vapor LED incandescent fluorescent

2 years ago

Which term refers to the way information is encoded into a radio signal? frequency spectrum modulation amplitude

2 years ago

Which is the lowest frequency? 800 MHz 216 MHz 1450 kHz 1000 kHz

2 years ago

The layer of charged particles that reflects some types of radio waves is called the _____. atmosphere ionosphere stratosphere troposphere

2 years ago

Which is not a characteristic of FM radio waves? better sound than AM waves more energy than AM waves greater distance than AM waves higher frequency than AM waves

2 years ago

The Federal Communications Commission assigns _____ for different organizations to use. frequencies amplitudes radios spectrums

2 years ago

Which is the lowest frequency? 800 MHz 1450 kHz 1000 kHz 216 MHz

2 years ago

The layer of charged particles that reflects some types of radio waves is called the _____. troposphere stratosphere atmosphere ionosphere

2 years ago

The Federal Communications Commission assigns _____ for different organizations to use. frequencies radios spectrums amplitudes

2 years ago

Which term refers to the way information is encoded into a radio signal? modulation frequency amplitude spectrum

2 years ago

Satellites are not typically used for _____ signals. cell phone global positioning FM AM

2 years ago

The first GPS was designed for use by _____. communications companies military services ships at sea commercial pilots

2 years ago

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 a another hub near your friend to a tower near you to a hub and then to a tower near your friend to a tower near you to a hub...

2 years ago

The Global Positioning System used by aircraft requires information from _____ satellites. 2 6 3 4

2 years ago

Cell phones use _____. high-frequency microwaves Ultra High Frequency (UHF) waves AM radio waves FM radio waves

2 years ago

The first GPS was designed for use by _____. military services ships at sea commercial pilots communications companies

2 years ago

Satellites are not typically used for _____ signals. AM FM cell phone global positioning

2 years ago

Most of the energy of an incandescent bulb is given off as _____. electricity infrared rays ultraviolet light visible light

2 years ago

What kind of waves do cellular telephones use to transmit and receive signals? gamma rays microwaves infrared rays ultraviolet rays

2 years ago

What is a neon light used for? to read X-ray negatives to see the inside of patients’ throats in operating rooms and hospitals in advertising signs and decoration

2 years ago

How can broadcasting stations send their signals around the world? using X-rays using TV satellites using the Global Positioning System using cellular telephones

2 years ago

Why is the ionosphere important to radio wave transmission? Both FM and AM waves reflect off it. FM waves reflect off it, but AM waves pass through it. Both AM and FM waves pass through it. AM waves reflect off it, but FM waves pass through it.

2 years ago

How do neon lights work? a solid is heated with electricity UV light causes powder to glow electric discharges through gases a filament glows when it gets hot

2 years ago

How do television signals reach your TV, even though there is not a continuous wire running from the TV broadcast to your home? television waves radio waves gamma waves electric waves

2 years ago

Cell phone signals are transmitted by _____ waves. ultraviolet X-ray radio infrared

2 years ago

Which type of radio broadcast has a greater broadcast range, AM or FM? AM because it reflects off the ionosphere AM because it does not reflect off the ionosphere FM because it reflects off the ionosphere FM because it does not reflect off the ionosphere

2 years ago

Which bulbs requires the most energy to produce the same amount of visible light? incandescent vapor lights tungsten-halogen fluorescent

2 years ago

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 at B. The signal starts at C and ends at B. The signal starts at A and ends at C. The signal starts at B and ends at C.

2 years ago

What do cell phones require to work? high-frequency microwaves ultraviolet rays satellites tuned to their wavelength the Global Positioning System

2 years ago

What is one drawback to using tungsten-halogen bulbs? They give off a significant amount of heat. They are filled with tungsten gas. They are less efficient than incandescent bulbs. They are not as bright as incandescent bulbs.

2 years ago

In AM radio, what do the letters “A” and “M” stand for? altitude modification amplitude merging amorphous modulation amplitude modulation

2 years ago

What is the frequency of something vibrating 1 million times per second? 1 kilohertz 1 hertz 1 megahertz 10 hertz

2 years ago

On AM broadcasts, what remains constant? the distance the frequency the music the amplitude

2 years ago

Most of the energy of an incandescent bulb is given off as _____. electricity ultraviolet light infrared rays visible light

2 years ago

What is a neon light used for? to read X-ray negatives in operating rooms and hospitals in advertising signs and decoration to see the inside of patients’ throats

2 years ago

What do cell phones require to work? high-frequency microwaves the Global Positioning System satellites tuned to their wavelength ultraviolet rays

2 years ago

Why is the ionosphere important to radio wave transmission? Both FM and AM waves reflect off it. AM waves reflect off it, but FM waves pass through it. FM waves reflect off it, but AM waves pass through it. Both AM and FM waves pass through it.

2 years ago

Which type of material scatters light as it passes through? Opaque Transparent Translucent

2 years ago

mir

Questions

Answers