This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: How is 21 cm radiation produced? What will be an ideal response? ... (Read 41 times)

chandani

  • Hero Member
  • *****
  • Posts: 541
on: Jul 27, 2018
How is 21 cm radiation produced?
 
  What will be an ideal response?

Question 2

What is the approximate chemical composition (by mass) with which all stars are born?
 
  A) three quarters hydrogen, one quarter helium, no more than 2 heavier elements
  B) half hydrogen and half helium
  C) 98 hydrogen, 2 helium
  D) 95 hydrogen, 4 helium, no more than 1 heavier elements


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

brittanywood

  • Sr. Member
  • ****
  • Posts: 355
Reply #1 on: Jul 27, 2018
Answer to Question 1

When the electron orbiting the proton for hydrogen flips its spin, the energy radiated has a wavelength of 21 cm., and is detected with radio telescopes.

Answer to Question 2

A


chandani

  • Member
  • Posts: 541
Reply 2 on: Jul 27, 2018
:D TYSM

DylanD1323

  • Member
  • Posts: 314
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.

Did you know?

Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Did you know?

Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Chim-Pom, in collaboration with Junichi Kakizaki, Radiation-Exposed Flowers Harmony. Chim-Pom, in collaboration with Junichi Kakizaki, Radiation-Exposed Flowers Harmony.
Sexual Response Cycle Sexual Response Cycle
Responses Produced by Activation of Specific Opioid Receptors Responses Produced by Activation of Specific Opioid Receptors
Agonists, partial agonists, and antagonists: (a) An agonist results in maximum response. (b) A ... Agonists, partial agonists, and antagonists: (a) An agonist results in maximum response. (b) A ...
Responses Produced by Activation of Specific Opioid Receptors Responses Produced by Activation of Specific Opioid Receptors
The stress response involves several pathways, which begin with a signaling stimulus The stress response involves several pathways, which begin with a signaling stimulus
Video: Muscle Twitch and Muscle Tension - Motor unit size and force

For a complete list of videos, visit our video library