Description

is a lens that possesses at least one surface that curves inwards
involve the transport of energy without the transport of matte
s a wave that is an oscillation of matter, and therefore transfers energy through a medium.
oscillates perpendicular to the axis along which the wave travels
is a region in a longitudinal wave where the particles are closest together.
hat are propagated by simultaneous periodic variations of electric and magnetic field intensity
the maximum extent of a vibration or oscillation, measured from the position of equilibrium.
distance between one peak or crest of a wave and the next peak or crest.
common unit of frequency is the hertz (Hz), corresponding to one crest per second.
The change in direction of a wave, such as a light or sound wave, away from a boundary the wave encounters.
typically accompanied by interference between the wave forms produced.
he process in which two or more light, sound, or electromagnetic waves of the same frequency combine to reinforce or cancel each other
is the characteristic of a sound that is primarily a psycho-physiological correlate of physical strength (amplitude).
a sound is determined by the rate of vibration, or frequency, of the sound wave.
a sound or series of sounds caused by the reflection of sound waves from a surface back to the listener.
an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other
a typical example: "the science or art of ordering tones or sounds in succession, in combination, and in temporal relationships
which a system oscillates when not subjected to a continuous or repeated external force.
ncrease in amplitude of oscillation of an electric
ncrease in amplitude of oscillation of an electric
that is a part of the harmonic series above a fundamental note and may be heard with it.
series above a fundamental note and may be heard with it.
prolongaprolongation of a sound; resonance.
vibrates in response to sound waves; the tympanic membrane.
one of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity
energy that travels by waves or particles, particularly electromagnetic radiation such as heat or x-rays.
an electromagnetic wave of a frequency between about 104 and 1011 or 1012 Hz, as used for long-distance communication
light rays which are longer than light but shorter than radio waves. Electromagnetic radiation with a wavelength between
a form of electromagnetic (EM) radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves.
in the part of the electromagnetic spectrum where wavelengths are just shorter than those of ordinary, visible violet light but longer than those of x-rays.
stream of such photons used for their penetrating power in radiography, radiology, radiotherapy, and scientific research.
penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei.
a high-frequency electromagnetic wave modulated in amplitude or frequency to convey a signal.
system of satellites, computers, and receivers that is able to determine the latitude and longitude of a receiver on Earth by calculating the time difference for signals from different satellites to reach the receiver.
he range of wavelengths or frequencies over which electromagnetic radiation extends.
the range of wavelengths

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Frequently Asked Questions

What is a crossword?

Crossword puzzles have been published in newspapers and other publications since 1873. They consist of a grid of squares where the player aims to write words both horizontally and vertically.

Next to the crossword will be a series of questions or clues, which relate to the various rows or lines of boxes in the crossword. The player reads the question or clue, and tries to find a word that answers the question in the same amount of letters as there are boxes in the related crossword row or line.

Some of the words will share letters, so will need to match up with each other. The words can vary in length and complexity, as can the clues.

Who is a crossword suitable for?

The fantastic thing about crosswords is, they are completely flexible for whatever age or reading level you need. You can use many words to create a complex crossword for adults, or just a couple of words for younger children.

Crosswords can use any word you like, big or small, so there are literally countless combinations that you can create for templates. It is easy to customise the template to the age or learning level of your students.

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How do I choose the clues for my crossword?

Once you’ve picked a theme, choose clues that match your students current difficulty level. For younger children, this may be as simple as a question of “What color is the sky?” with an answer of “blue”.

Are crosswords good for students?

Crosswords are a great exercise for students' problem solving and cognitive abilities. Not only do they need to solve a clue and think of the correct answer, but they also have to consider all of the other words in the crossword to make sure the words fit together.

Crosswords are great for building and using vocabulary.

If this is your first time using a crossword with your students, you could create a crossword FAQ template for them to give them the basic instructions.

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Can I create crosswords in other languages?

Crosswords are a fantastic resource for students learning a foreign language as they test their reading, comprehension and writing all at the same time. When learning a new language, this type of test using multiple different skills is great to solidify students' learning.

We have full support for crossword templates in languages such as Spanish, French and Japanese with diacritics including over 100,000 images, so you can create an entire crossword in your target language including all of the titles, and clues.