GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 21 Jul 2018, 04:57

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Every element on the periodic chart is radioactive, although

Author Message
Senior Manager
Joined: 19 Nov 2007
Posts: 433

### Show Tags

10 Jan 2009, 23:55
1
00:00

Difficulty:

(N/A)

Question Stats:

50% (01:28) correct 50% (00:04) wrong based on 4 sessions

### HideShow timer Statistics

Every element on the periodic chart is radioactive, although the most stable elements have half-lives which are thousands and thousands of years long. When an atom decays, it splits into two or more smaller atoms. Even considering the fusion taking place inside of stars, there is only a negligible tendency for smaller atoms to transmute into larger ones. Thus, the ratio of lighter to heavier atoms in the universe is increasing at a measurable rate.

Which of the following sentences provides the most logical continuation of this paragraph?

(A) Without radioactive decay of atoms, there could be no solar combustion and no life as we know it.
(B) Therefore, it is imperative that scientists begin developing ways to reverse the trend and restore the proper balance between the lighter and heavier elements.
(C) Consequently, it is possible to use a shifting ratio of light to heavy atoms to calculate the age of the universe.
(D) Therefore, there are now more light elements in the universe than heavy ones.
(E) As a result, the fusion taking place inside stars has to produce enough atoms of the heavy elements to offset the radioactive decay of large atoms elsewhere in the universe.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

-Underline your question. It takes only a few seconds!
-Search before you post.

Director
Joined: 29 Aug 2005
Posts: 817

### Show Tags

11 Jan 2009, 07:56
Pretty tough CR - I chose C.
VP
Joined: 05 Jul 2008
Posts: 1332

### Show Tags

11 Jan 2009, 15:27
botirvoy wrote:
Pretty tough CR - I chose C.

Why C? How can you calculate the age of the universe? any explanation or POE?
Senior Manager
Joined: 02 Nov 2008
Posts: 253

### Show Tags

11 Jan 2009, 16:35
vscid wrote:
Every element on the periodic chart is radioactive, although the most stable elements have half-lives which are thousands and thousands of years long. When an atom decays, it splits into two or more smaller atoms. Even considering the fusion taking place inside of stars, there is only a negligible tendency for smaller atoms to transmute into larger ones. Thus, the ratio of lighter to heavier atoms in the universe is increasing at a measurable rate.

Which of the following sentences provides the most logical continuation of this paragraph?

(A) Without radioactive decay of atoms, there could be no solar combustion and no life as we know it.
(B) Therefore, it is imperative that scientists begin developing ways to reverse the trend and restore the proper balance between the lighter and heavier elements.
(C) Consequently, it is possible to use a shifting ratio of light to heavy atoms to calculate the age of the universe.
(D) Therefore, there are now more light elements in the universe than heavy ones.
(E) As a result, the fusion taking place inside stars has to produce enough atoms of the heavy elements to offset the radioactive decay of large atoms elsewhere in the universe.

This is how I came with C:
The paragraph ends talking about measurements so that's a clue
A - Solar combustion? this was never discussed
B - Imperative? Why is it imperative?
C- Looks ok
D - More light elements? We are only told about that the RATIO is increasing att a measurable rate
E - Fusion taking place?
Intern
Joined: 01 Jan 2009
Posts: 7
Schools: UCB, UCLA

### Show Tags

11 Jan 2009, 23:58
Should be C
Senior Manager
Joined: 23 May 2008
Posts: 386

### Show Tags

12 Jan 2009, 00:26
realy tough......
I have a doubt b/w C & E.....
but i would choose E as my answer
Manager
Status: Stanford GSB
Joined: 02 Jun 2008
Posts: 89

### Show Tags

12 Jan 2009, 02:42
1
C is clearly the correct answer. My explanation is in RED.

Every element on the periodic chart is radioactive, although the most stable elements have half-lives which are thousands and thousands of years long. When an atom decays, it splits into two or more smaller atoms. Even considering the fusion taking place inside of stars, there is only a negligible tendency for smaller atoms to transmute into larger ones. Thus, the ratio of lighter to heavier atoms in the universe is increasing at a measurable rate.

Which of the following sentences provides the most logical continuation of this paragraph?

(A) Without radioactive decay of atoms, there could be no solar combustion and no life as we know it.
No mention of Solar Combustion in the question stem.We cannot have a new idea/information in a logical continuation.It should be deducted from the stem.
(B) Therefore, it is imperative that scientists begin developing ways to reverse the trend and restore the proper balance between the lighter and heavier
elements.
Does not sound logical. Nothing has been told why should they reverse the trend. Moreover "eliments" instead of "atom".
(C) Consequently, it is possible to use a shifting ratio of light to heavy atoms to calculate the age of the universe.
As "the ratio of lighter to heavier atoms in the universe is increasing at a measurable rate." we can use this trend to calculate the age of universe. For example If in 2009, heavy: light= 4:10 ; 2000 years back, heavy: light=3:10 ; 4000 years back, heavy:light=2:10. And the same ratio is 1:10 in a new universe, most probably(in case of straight line equation) it will be 6000 years old
(D) Therefore, there are now more light elements in the universe than heavy ones.
Cannot be concluded, only the ratio of lighter to heavy atoms is increasing. There can be more heavy atoms still now. "Elements" instead of "atom"
(E) As a result, the fusion taking place inside stars has to produce enough atoms of the heavy elements to offset the radioactive decay of large atoms elsewhere in the universe.
Not a logical continuation of the idea given in the question. As a result of what? It suggests, as a result of the increasing ratio??? Moreover,why the fusions will work to offset the radioactive decay
Retired Moderator
Joined: 18 Jul 2008
Posts: 897

### Show Tags

12 Jan 2009, 09:33
went with E. Will try to explain if correct.
Senior Manager
Joined: 19 Nov 2007
Posts: 433

### Show Tags

12 Jan 2009, 20:59
OA C.
good job explaining sandip. +1.
_________________

-Underline your question. It takes only a few seconds!
-Search before you post.

VP
Joined: 18 May 2008
Posts: 1179

### Show Tags

13 Jan 2009, 00:15
@Sandip, +1 from me too

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Display posts from previous: Sort by

# Every element on the periodic chart is radioactive, although

Moderators: GMATNinja, GMATNinjaTwo

# Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.