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

Author Question: A convex spherical mirror has a focal length of magnitude 20 cm. If an object is placed 10 cm in ... (Read 68 times)

WWatsford

  • Hero Member
  • *****
  • Posts: 539
    • Biology Forums!
on: Jul 29, 2018
A convex spherical mirror has a focal length of magnitude 20 cm. If an object is placed 10 cm in front of the mirror on the mirror's axis, where is the image located?
 
  A) 20 cm behind the mirror
  B) 20 cm in front of the mirror
  C) 6.7 cm behind the mirror
  D) 6.7 cm in front of the mirror

Question 2

The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years. Suppose you have samples of both isotopes, and that they initially have the same activity (number of decays per second).
 
  What must be true of the numbers of cobalt-60 and strontium-90 nuclei in these samples? A) There are more strontium-90 than cobalt-60 nuclei.
  B) There are equal numbers of cobalt-60 and strontium-90 nuclei.
  C) There are more cobalt-60 than strontium-90 nuclei.
  D) It is not possible to compare numbers of nuclei without knowing the masses of the samples.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Awesome

  • Sr. Member
  • ****
  • Posts: 280
Reply #1 on: Jul 29, 2018
Answer to Question 1

C

Answer to Question 2

A


WWatsford

  • Member
  • Posts: 539
Reply 2 on: Jul 29, 2018
Gracias!

tkempin

  • Member
  • Posts: 332
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

Did you know?

Automated pill dispensing systems have alarms to alert patients when the correct dosing time has arrived. Most systems work with many varieties of medications, so patients who are taking a variety of drugs can still be in control of their dose regimen.

Did you know?

Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

Did you know?

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

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Andromeda as depicted in Urania's Mirror, set of constellation cards published in London c.1825 Andromeda as depicted in Urania's Mirror, set of constellation cards published in London c.1825
Volvulus. A length of small intestine has twisted around itself, cutting off blood circulation to th Volvulus. A length of small intestine has twisted around itself, cutting off blood circulation to th
Measuring an infant’s length Measuring an infant’s length
The Global Positioning System determines the location of an object from its distances to ... The Global Positioning System determines the location of an object from its distances to ...
A uniform solid cylinder of radius R and a thin uniform spherical shell of radius R both roll ... A uniform solid cylinder of radius R and a thin uniform spherical shell of radius R both roll ...
Video: Cardiac Cycle (Part 4 of 4)

For a complete list of videos, visit our video library