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ozzi
3 years ago
9

Jai was measuring the radioactivity of different radioactive isotopes. Isotope A had a starting radioactive level of 50 g, and a

fter 4 days it measured at 30 g. Isotope B had a starting radioactive level of 75 g, and after 4 days it measured at 25 g. Which best explains the isotopes?
A.)Isotope A has a shorter half-life than Isotope B.
B.)Isotope A has a longer half-life than Isotope B.
C.)Isotope A has half the half-life of Isotope B.
D.)Isotope A has twice the half-life of Isotope B.
Physics
2 answers:
MArishka [77]3 years ago
8 0

Answer:

B) Isotope A has a longer half-life than Isotope B

Explanation:

KengaRu [80]3 years ago
3 0
B) Isotope A has a longer half-life than Isotope B
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Now suppose that I do something to create a magnetic field in a known direction and perpendicular to the horizontal component of the Earth’s magnetic field. Here is an example where I put a current carrying wire right over the compass needle. Since the compass is underneath the wire, the magnetic field due to the wire will be 90° to the Earth’s magnetic field.

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3 years ago
Why did thomson’s results from experimenting with cathode rays cause a big change in scientific thought about atoms?
natima [27]

Answer:

Explanation:

Before Thomson's discovery, atoms were believed according to the "Dalton's atomic theory" to be the smallest indivisible particle of any matter. This makes atoms the smallest unit of a matter.

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Thomson through his experiment was able determine perfectly well the nature of the rays he saw emanating from the cathode. One of his findings shows that the rays are negatively charged and are repelled by negative charges.

The discovery of electrons further led to more works on the atom and other particles were discovered. Atoms were no longer seen as indivisible or the smallest particles of matter.

3 0
3 years ago
You are standing 1 meter from a squawking parrot. If you move to a distance three meters away, the sound
spayn [35]
Use the inverse square law, thus if you move a distance of 3m away, the sound intensity decrease by 1/3^2= 1/9
5 0
3 years ago
Read 2 more answers
Suppose a log’s mass is 5 kg. After burning, the mass of the ash is 1 kg. What can you predict has happened to the other 4 kg?
ycow [4]

Answer:

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Explanation:

5 0
3 years ago
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ValentinkaMS [17]

Answer:

4.80 seconds

Explanation:

The velocity of sound is obtained from;

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Where;

V= velocity of sound = 329.2 ms-1

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t= time = the unknown

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t= 2 × 790.5/ 329.2

t= 4.80 seconds

8 0
3 years ago
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