Physical Science

posted by .

1. Which equation correctly shows beta decay?
(A) 210/82 Pb -> 209/81 Tl + 0/-1 e + y
(B) 210/82 Pb -> 209/83 Bi + 0/-1 e + y
(C) 210/82 Pb -> 210/83 Tl + 0/-1 e + y
(D) 210/82 Pb -> 210/83 Bi + y
(E) 210/82 Pb -> 210/83 Bi + 0/-1 e + y


2. The half-life if radon-222 is 3.8 days. If a sample currently has 3.1 grams of radon-222, how much radon-222 did this sample have 15.2 days ago?

(A) 12.4 grams
(B) 47.1 grams
(C) 49.6 grams
(D) 57.8 grams
(E) 92.7 grams


The two questions that I can't figure out on my Science homework. Please help!

  • Physical Science -

    (E) 210/82 Pb -> 210/83 Bi + 0/-1 e + y
    (C) 49.6 grams

  • Physical Science -

    (E) 210/82Pb-> 210/83Bi + 0/-1e +Y
    (A) 12.4 grams

  • Physical Science -

    djikopp[

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    Expressed to the correct number of significant figures, the sum of two masses is 445.2 grams. WHich two masses produce this answer?
  2. Physics

    While standing on a frictionless ice surface, a 50 kg skater pushes against a wall with an average force of 150 N west for 0.210 s. Calculate the velocity of the skater at 0.210 s. This was what i did: m = 50 kg Fnet = 150 N t = 0.210 …
  3. Nuclear Physics

    If a polonium-210 (Po-210) atom has just decayed, how close can the ejected alpha particle get to a neighboring Po-210 nucleus?
  4. physics

    If a polonium-210 (Po-210) atom has just decayed, how close can the ejected alpha particle get to a neighboring Po-210 nucleus?
  5. Physics

    If a polonium-210 (Po-210) atom has just decayed, how close can the ejected alpha particle get to a neighboring Po-210 nucleus?
  6. Physics

    If a polonium-210 (Po-210) atom has just decayed, how close can the ejected alpha particle get to a neighboring Po-210 nucleus?
  7. Nuclear Physics

    If a polonium-210 (Po-210) atom has just decayed, how close can the ejected alpha particle get to a neighboring Po-210 nucleus?
  8. Chemistry H

    60.0 grams of Th-210 with a half life of 50,000 years is allowed to decay for 250,000 years. How much of the original quantity remains?
  9. Chemistry

    Po-210 Ia an alpha emitter with a half-life of 138 days. how many grams of Po-210 remain after 552 days if the sample initially contained 5.80g of Po-210?
  10. Physical Science

    Balancing Decay Reactions. Fill in the blank with the correct piece to balance the decay equation. 1. (184/74) W (4/2) He + _____ 2. (210/82) Pb______+ (206/80) Hg 3. (35/16) S  (0/-1) e + _______ 4. ________ …

More Similar Questions