1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lilavasa [31]
3 years ago
9

What percent of a sample of As-81 remains un-decayed after 43.2 seconds

Biology
1 answer:
mestny [16]3 years ago
3 0
Where Ao = starting amount, At = amount after time t, and k = rate constant 

<span>You are given that the half-life is 33 seconds </span>
<span>Calculate the rate constant </span>
<span>ln(2/1) = kx33 sec </span>
<span>0.693 = kx33 </span>
<span>k = 0.0210 s^-1 </span>

<span>Now calculate the amount left after 43.2 sec </span>
<span>ln(100%/A1%) = 0.0210 x 43.2 </span>
<span>ln(100/A1) = 0.9074 </span>
<span>100/A1 = 2.478 </span>
<span>A1 = 40.4%</span>
You might be interested in
One of the primary functions of RNA molecules is to _____. One of the primary functions of RNA molecules is to _____. act as a p
nadya68 [22]

Answer: function in the synthesis of proteins

Explanation:

Ribonucleic acid or RNA is a kind of essential nucleic acid present in the cells of the living beings. The main function of the RNA is to carry the information present in the coded form in amino acid sequence obtain from the genes to produce protein molecules. The amino acid sequence gets assembled on the ribosome brought about by the messenger RNA (mRNA) each amino acid sequence encodes for a typical protein molecule. A single strand of DNA acts as a blueprint for the synthesis of mRNA which is transcribed from the strand of DNA.

7 0
3 years ago
A mudflow consists of debris with a large amount of
vova2212 [387]
Hii Mate____ ^_^
.
.
.
.
here's your answer___⤵

♦A mudflow consists of debris with a large amount of  partially or fully liquified by the addition of significant amounts of water to the source material.
.
_____
HOPE IT HELPS!!☺
MARK AS BRAINLIEST PLEASE
6 0
3 years ago
4. Compare and contrast the structure and function of a compound light microscope and a dissecting microscope. Be sure to discus
vovangra [49]
<span>Compound Microscope Compound microscope is commonly used in the schools and colleges. It comes under the category of microscopes used in biology. It has two lenses namely the objective lens and the ocular lens. It provides a magnification of 1500X. Eyepiece lens is of 10X or 15X power. It is used to observe bacterial, protozoa, various cells, etc.</span>
5 0
3 years ago
Most dissolved carbon in the ocean is used to form which structure in marine organisms?
Ber [7]
<span>counteracted acidification</span>
6 0
3 years ago
Read 2 more answers
What could be a result of an injury to the dorsal column? loss of sensation to pressure and touch loss of control over all invol
IRINA_888 [86]

Answer:

The correct answer would be a loss of sensation to pressure and touch.

The dorsal column-medial lemniscus pathway abbreviated as DCML refers to the sensory pathway of the central nervous system (CNS) which transmits sensations of vibration, fine touch, proprioception, and two-point discrimination from the skin as well as joints.  

Thus, injury to the dorsal column would result in the loss of sensation to touch and pressure.

7 0
3 years ago
Read 2 more answers
Other questions:
  • During cell division, centromeres have separated, and chromatids are pulled apart, becoming chromosomes. What happens after the
    5·2 answers
  • How can a lemon be alkaline if it's full of citric acid?
    8·1 answer
  • Which best describes adaptive radiation?
    12·1 answer
  • Why is freezing water extremely biologically relevant?
    6·1 answer
  • How does a cardinal help limit the size of the sunflower population in its ecosystem
    11·2 answers
  • What is the name of the solid part of Earth, including rock, minerals, and metals?
    13·2 answers
  • The effect of a hormone on a target cell may be decreased by the presence of ________.
    12·2 answers
  • Help me as soon as possible!
    9·1 answer
  • The following diagram shows the branching tree diagram for some animals.
    12·2 answers
  • What is an example of the adaptive managing technique? What is it being used for?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!