Distributed Block - View: Magazine: Latest Cover

4/30/16 cover

Eureka! Lab

A place for discovery 
Bethany Brookshire

Eureka! Lab

Scientists Say

Scientists Say: Frequency

A wavelength is distance, but the number of wavelengths over time is frequency

Eureka! Lab
frequency

This shows the comparison between wavelength and frequency in waves of light. Wavelengths that are long will have low frequencies because they are so large. 

NASA's Imagine the Universe

Frequency (noun, “FREE-kwen-see”)

This is the number of times that a periodic event occurs over a particular unit of time. Periodic events are often waves — such as sound waves— and are measured in wavelengths. The number of wavelengths over time is known as the frequency. But frequency can also be used for other things, such as the number of rotations on a wheel over time. Frequency is measured in hertz — the number of times a cycle repeats per second.

In a sentence

A radio telescope identified a certain frequency of radio wave bursts to intelligent life. Unfortunately, that life turned out be us. 

Follow Eureka! Lab on Twitter

Power Words

(for more about Power Words, click here)

frequency  The number of times a specified periodic phenomenon occurs within a specified time interval. (In physics) The number of wavelengths that occurs over a particular interval of time.

hertz  The frequency with which something (such as a wavelength) occurs, measured in the number of times the cycle repeats during each second of time.

wavelength  The distance between one peak and the next in a series of waves, or the distance between one trough and the next. Visible light — which, like all electromagnetic radiation, travels in waves — includes wavelengths between about 380 nanometers (violet) and about 740 nanometers (red). Radiation with wavelengths shorter than visible light includes gamma rays, X-rays and ultraviolet light. Longer-wavelength radiation includes infrared light, microwaves and radio waves.

Readability Score: 
Sticky: 
0
By Bethany Brookshire 7:00am, April 21, 2016
foldscope
Classroom microscopes can be clunky and costly. An inventor has designed one so small, tough and cheap that it can go home in every kid’s backpack.
By Bethany Brookshire 7:00am, April 18, 2016
black holes
On Earth, scientists measure energy use in watts. When you have lot of those watts — one million billion billion — you have a yottawatt.
By Bethany Brookshire 7:00am, April 12, 2016
anglerfish
Many classrooms teach electric circuits with batteries and wires. But with e-textiles, students can help design and light up their own art projects.
By Bethany Brookshire 7:00am, April 11, 2016
waves
When something travels as a wave — such as light — scientists can measure it by its wavelength, the distances between the peaks.
By Bethany Brookshire 7:00am, April 4, 2016
lightbulb
Say Watt? This is a unit used to measure the flow of energy being used.
By Bethany Brookshire 7:00am, March 28, 2016
y axis
The bars on a graph tell you nothing unless you know what they mean. The lines on the sides can let you know.
By Bethany Brookshire 7:00am, March 25, 2016
holding phone
The way you move is specific to you, and only you. A teen shows the way someone picks up a phone could be used as a ‘secure’ ID.
By Bethany Brookshire 7:00am, March 24, 2016
George Hou
One teen set out to improve the hearing aid his grandfather hated. His new mathematical model amplifies only what people most want to hear.
By Bethany Brookshire 7:00am, March 22, 2016
Stream quality
Shocked to find out how much phosphorus was in local streams, a teen invented a filter to remove it.
By Bethany Brookshire 7:00am, March 21, 2016
bread
For some people, yeast bring to mind slimy infections. But these little fungal beasts are used to make bread rise, too.
Subscribe to RSS - Eureka! Lab

From the SSP Newsroom

Science News

Loading...

Science News for Students

Loading...

Eureka! Lab

Loading...