« previous next »

Author Question: What form of seismic waves travel in compressions and decompressions? a. systematic waves b. ... (Read 101 times)

bobbie

  • Hero Member
  • *****
  • Posts: 592
on: Jul 27, 2018
What form of seismic waves travel in compressions and decompressions?
 
  a. systematic waves
  b. earthquake waves
  c. pressure waves
 d. shear waves
 e. gravity waves

Question 2

What observations indicate the presence of dust in the interstellar medium?
 
  What will be an ideal response?


hollysheppard095

  • Sr. Member
  • ****
  • Posts: 339
Reply #1 on: Jul 27, 2018
Answer to Question 1

c

Answer to Question 2

The dust in the ISM makes distant stars appear fainter than they would if space were
perfectly transparent. This phenomenon is called interstellar extinction, and in the neighborhood of the Sun it amounts to about 1 magnitude per thousand parsecs (pc) at visual wavelengths.

The ISM dust also affects the colors of stars. That is the reason why extinction is more severe at shorter wavelengths, which makes stars look redder than they should be. Some hot but distant O stars, for instance, actually look red and not blue. This effect is called interstellar reddening.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

Did you know?

A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.

Did you know?

More than 4.4billion prescriptions were dispensed within the United States in 2016.

Did you know?

Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.

Did you know?

All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

Percutaneous ultrasonic lithotripsy. A nephroscope is inserted into the renal pelvis, and ultrasound Percutaneous ultrasonic lithotripsy. A nephroscope is inserted into the renal pelvis, and ultrasound
Example of Truth in Lending form. Example of Truth in Lending form.
The I-9 form Cont The I-9 form Cont
Processes of the Middle and Upper Troposphere: Rossby Waves and Vorticity Processes of the Middle and Upper Troposphere: Rossby Waves and Vorticity
Waves Approaching the Shore Waves Approaching the Shore
The age-adjusted rate of melanoma, a deadly form of skin cancer, from 1973 to 2000. Over that time p The age-adjusted rate of melanoma, a deadly form of skin cancer, from 1973 to 2000. Over that time p
Video: Role of the respiratory system - effect of altered ventilation rates

For a complete list of videos, visit our video library