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
vazorg [7]
1 year ago
15

the half-life of iodine-131 is 8.1 days. how much time had passed if i only have one-fourth of the original sample?​

Physics
1 answer:
morpeh [17]1 year ago
8 0

Answer:

16.2 days

Explanation:

Find the number of halflives:

1/2   *  1/2 =  1/4     so <u>two</u>   halflives have passed

   2 * 8.1 days = 16.2 days

You might be interested in
EXTREME HELP!!!!
mrs_skeptik [129]

the anwser is c is always the best anwser


8 0
4 years ago
Determine the energy in joules of a photon whose frequency is 3.55 x10^17 hz
asambeis [7]
By using the Plancks-Einstein equation, we can find the energy;
E = hf
where h is the plancks constant = 6.63 x 10⁻³⁴
f = frequency = 3.55 x 10¹⁷hz
E = (6.63 x 10⁻³⁴) x (3.55 x 10¹⁷)
E = 2.354 x 10⁻¹⁶J
3 0
3 years ago
If you want to make a flashlight and have two batteries and a light bulb how would you hook them up to make it bright and why?
ValentinkaMS [17]

Answer:

The positive end of battery 1 touching the negative end of battery 2 and wires connecting the negative of battery 1 to the light light bulb and the positive of battery 2 to the light bulb.

Explanation:

7 0
3 years ago
How r u?<br> Are u good?
Maslowich

Answer:

i'm good, hru hope ur staying safe

Explanation:

6 0
3 years ago
Read 2 more answers
I REALLY NEED HELP
ikadub [295]
The first law of thermodynamics states the conservation of energy and heat where the total energy in an isolated system may be transformed into another, but never created or destroyed. If 286 J of energy was released to the room, then also 286 J of energy was also removed from food in that refrigerator assuming it is an isolated system.   :)

Read more on Brainly - brainly.com/sf/question/3844753
I tried to help
3 0
3 years ago
Other questions:
  • One airplane is approaching an airport from the north at 181 kn/hr. A second airplane approaches from the east at 278 km/hr. Fin
    6·1 answer
  • A 10.0-cm-diameter and a 20.0-cm-diameter charged ring are arranged concentrically (so they share the same axis). Assume both ar
    6·1 answer
  • Which of the following phrases best describes the term "magnetic flux"?
    11·1 answer
  • A scientist prepares a colloidal solution and pours it into a glass tank. She then flashes a beam of white light into one end of
    7·2 answers
  • A system of pulleys is called an ?
    5·1 answer
  • Interpret using 12 as a reference point how can you tell that the hands of the clock on the right have moved from the previous p
    11·1 answer
  • A woman pushes a 3.2kg textbook on a table as she walks forward 3.5 meters. How much work does the vertical component of the for
    11·1 answer
  • A meterstick is initially standing vertically on the floor. If the meterstick falls over, with what angular velocity will it hit
    12·1 answer
  • How much heat is absorbed by 3 kg honey baked ham as energy from the oven causes its temperature to change from 10°C to 60°C? (S
    13·1 answer
  • A model shows a machine that works using electric fields. What would this machine need for the electrical field to function prop
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!