At around 1:12 she explains that it takes 8 min too come to Earth. (the light) so I'm thinking that when we look at the sun, we're looking at how it looked like 8 min ago?

yes but there are many stars light years away that there light are traveling here.

What is another threat to earth? Does the Ozone count as one?

Unless aliens tried to kill us all the sun is the biggest threat to earth.

I didn't understand how all the photos emitted by the sun travel at the same speed even though they have different frequencies. Frequency is inversely proportional to Time, also Speed is inversely proportional to Time. Therefore Frequency is directly proportional to Speed. So, if the photons have variable frequencies each, their corresponding speed must also vary accordingly. Therefore if the 'speed of light's is the speed of visible light ONLY, then radio waves should travel slower than visible light, whereas gamma waves should have a speed way higher than the speed of light.

Frequency is not proportional to time or speed for electromagnetic waves. It is proportional to energy. Speed is constant.

Looking at the chart of wavelengths at 1:45, it seems that if the portion of the electromagnetic spectrum our eyes receive was a bit different, we could 'see' radio waves

It would have to be quite a bit different, but yes, theoretically possible. Using technology we are able to "see" radio waves in a way by using technology to observe it for us and "translate" it into information we can understand, like sound, videos, and so forth. An example is a car radio, it receives radio waves and turns it into sound for us to understand.

Main content

The electromagnetic spectrum

Name: The electromagnetic spectrum
Uploaded: 2014-05-06T22:41:19Z
Description: The Sun is constantly broadcasting information about its activity in the form of light waves. Find out why there’s more to see than what meets the eye…

Google Classroom

The Sun is constantly broadcasting information about its activity in the form of light waves. Find out why there’s more to see than what meets the eye…. Created by NOVA.

Want to join the conversation?

Sort by:

abigail song
Posted 8 years ago. Direct link to abigail song's post “At around 1:12 she explai...”
At around
1:12
she explains that it takes 8 min too come to Earth. (the light) so I'm thinking that when we look at the sun, we're looking at how it looked like 8 min ago?
Button navigates to signup pageComment on abigail song's post “At around 1:12 she explai...”
(4 votes)
Answer
- Blake Parsons (Quest to 10,000,000... 75% complete!!!)
  Posted 7 years ago. Direct link to Blake Parsons (Quest to 10,000,000... 75% complete!!!)'s post “yes but there are many st...”
  yes but there are many stars light years away that there light are traveling here.
  Comment on Blake Parsons (Quest to 10,000,000... 75% complete!!!)'s post “yes but there are many st...”
  (2 votes)
EzraKim
Posted 8 years ago. Direct link to EzraKim's post “What is another threat to...”
What is another threat to earth? Does the Ozone count as one?
Button navigates to signup pageComment on EzraKim's post “What is another threat to...”
(3 votes)
Answer
- ţh€ €ℓď€я ๏ɲ€
  Posted 8 years ago. Direct link to ţh€ €ℓď€я ๏ɲ€'s post “Unless aliens tried to ki...”
  Unless aliens tried to kill us all the sun is the biggest threat to earth.
  Comment on ţh€ €ℓď€я ๏ɲ€'s post “Unless aliens tried to ki...”
  (2 votes)
Anwesha Donna
Posted 5 years ago. Direct link to Anwesha Donna's post “I didn't understand how a...”
I didn't understand how all the photos emitted by the sun travel at the same speed even though they have different frequencies. Frequency is inversely proportional to Time, also Speed is inversely proportional to Time. Therefore Frequency is directly proportional to Speed.
So, if the photons have variable frequencies each, their corresponding speed must also vary accordingly. Therefore if the 'speed of light's is the speed of visible light ONLY, then radio waves should travel slower than visible light, whereas gamma waves should have a speed way higher than the speed of light.
Button navigates to signup pageComment on Anwesha Donna's post “I didn't understand how a...”
(2 votes)
Answer
- Davin V Jones
  Posted 5 years ago. Direct link to Davin V Jones's post “Frequency is not proporti...”
  Frequency is not proportional to time or speed for electromagnetic waves. It is proportional to energy. Speed is constant.
  Button navigates to signup page
  (3 votes)
James Hulce
Posted 8 years ago. Direct link to James Hulce's post “Looking at the chart of w...”
Looking at the chart of wavelengths at
1:45
, it seems that if the portion of the electromagnetic spectrum our eyes receive was a bit different, we could 'see' radio waves
Button navigates to signup pageButton navigates to signup page
(2 votes)
Answer
- Jon Winder
  Posted 8 years ago. Direct link to Jon Winder's post “It would have to be quite...”
  It would have to be quite a bit different, but yes, theoretically possible. Using technology we are able to "see" radio waves in a way by using technology to observe it for us and "translate" it into information we can understand, like sound, videos, and so forth. An example is a car radio, it receives radio waves and turns it into sound for us to understand.
  Button navigates to signup page
  (2 votes)
Robert Campbell
Posted 7 years ago. Direct link to Robert Campbell's post “Are the radio waves emitt...”
Are the radio waves emitted by the sun identical to the radio waves used on earth to construct standard AM and FM radio that we all use? How are the radio waves emitted by the sun measured?
Button navigates to signup pageButton navigates to signup page
(2 votes)
Answer
donnacotehome
Posted 7 years ago. Direct link to donnacotehome's post “Do radio waves have the l...”
Do radio waves have the lowest energy on the electromagnetic spectrum?
Button navigates to signup pageButton navigates to signup page
(1 vote)
Answer
- sarah ehrenfried
  Posted 4 years ago. Direct link to sarah ehrenfried's post “yes, radio waves have the...”
  yes, radio waves have the lowest energy.
  Button navigates to signup page
  (1 vote)
taneesha MD
Posted 7 years ago. Direct link to taneesha MD's post “can anybody please help m...”
can anybody please help me in understanding how hydrogen atoms fuse to form helium atoms as said in the video?
Button navigates to signup pageButton navigates to signup page
(1 vote)
Answer
- Davin V Jones
  Posted 7 years ago. Direct link to Davin V Jones's post “See this video: https://w...”
  See this video: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-life-death-tutorial/v/birth-of-stars
  Button navigates to signup page
  (1 vote)

NOVA Labs

Course: NOVA Labs > Unit 1

The electromagnetic spectrum

Want to join the conversation?

Video transcript