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

Author Question: Naturally radioactive nuclei can decay spontaneously by emitting the following particles: a. helium ... (Read 100 times)

leilurhhh

  • Hero Member
  • *****
  • Posts: 560
on: Jul 28, 2018
Naturally radioactive nuclei can decay spontaneously by emitting the following particles:
 a. helium nuclei, electrons, photons
  b. electrons, neutrons, protons
  c. helium nuclei, electrons, protons
  d. electrons, neutrons, photons
  e. quarks and leptons

Question 2

How many radioactive atoms are present in a sample that has an activity of 0.5 mCi and a half-life of 10 years? (1 curie = 3.7  1010 decays/s)
 a. 9.5  1012 atoms
  b. 8.4  1012 atoms
  c. 7.3  1012 atoms
  d. 6.5  1012 atoms
  e. 2.7  105 atoms


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

robbielu01

  • Sr. Member
  • ****
  • Posts: 336
Reply #1 on: Jul 28, 2018
Answer to Question 1

A

Answer to Question 2

B


leilurhhh

  • Member
  • Posts: 560
Reply 2 on: Jul 28, 2018
Excellent

chereeb

  • Member
  • Posts: 326
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

Did you know?

Blood is approximately twice as thick as water because of the cells and other components found in it.

Did you know?

Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Did you know?

Vaccines prevent between 2.5 and 4 million deaths every year.

Cultured HeLa cells have been stained with Hoechst turning their nuclei blue Cultured HeLa cells have been stained with Hoechst turning their nuclei blue
Isotopes may be stable or radioactive depending on the arrangement and number of neutrons in the nuc Isotopes may be stable or radioactive depending on the arrangement and number of neutrons in the nuc
Case of ONJ that occurred spontaneously. Note the white area, which is exposed necrotic bone. Case of ONJ that occurred spontaneously. Note the white area, which is exposed necrotic bone.
Bright-Line Spectra of Hydrogen and Helium Bright-Line Spectra of Hydrogen and Helium
If 2.00 g of helium gas and 4.72 g of oxygen gas are mixed together, what is the mole fraction ... If 2.00 g of helium gas and 4.72 g of oxygen gas are mixed together, what is the mole fraction ...
Photomicrographs comparing cheek epithelial cell nuclei Photomicrographs comparing cheek epithelial cell nuclei
Video: What are the Parts of a Plant Cell?

For a complete list of videos, visit our video library