« previous next »

Author Question: A ruby laser beam ( = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the moon, ... (Read 105 times)

big1devin

  • Hero Member
  • *****
  • Posts: 583
on: Jul 28, 2018
A ruby laser beam ( = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the moon, 384,000 km away. What is the radius of the big red spot on the moon?
 a. 500 m
  b. 250 m
  c. 120 m
  d. 1.0 km
  e. 2.7 km

Question 2

The Moon's average density is
 a. greater than Earth's.
  b. less than Earth's.
  c. approximately the same as Earth's.
  d. nonexistent because water is not present.


makaylafy

  • Sr. Member
  • ****
  • Posts: 347
Reply #1 on: Jul 28, 2018
Answer to Question 1

c

Answer to Question 2

b


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

big1devin

  • Hero Member
  • *****
  • Posts: 583
Reply #2 on: Jul 28, 2018
Thanks


makaylafy

  • Sr. Member
  • ****
  • Posts: 347
Reply #3 on: Jul 28, 2018
Welcome :)


« previous next »
 

Did you know?

During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

Did you know?

Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.

Did you know?

Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

Did you know?

Medication errors are three times higher among children and infants than with adults.

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

This image shows an artists depiction of a 10-kilometer (six-mile) diameter astero This image shows an artists depiction of a 10-kilometer (six-mile) diameter astero
A laser-guided observation of the Milky Way Galaxy at the Paranal Observatory in Chile in 2010. A laser-guided observation of the Milky Way Galaxy at the Paranal Observatory in Chile in 2010.
True-color view of Mars seen through NASA's Hubble Space Telescope in 1999 True-color view of Mars seen through NASA's Hubble Space Telescope in 1999
Bones do not allow the X-ray beam to pass through them, resulting in an image of the bones on the ... Bones do not allow the X-ray beam to pass through them, resulting in an image of the bones on the ...
Moon Moon
Telescope Telescope
Video: Facilitated Diffusion - Glucose transport

For a complete list of videos, visit our video library