1. What is meant by half-life?The time for a radioactive sample to reduce to half of its radioactivity.
The time for half of a radioactive sample to decay into new substances.
The time for a radioactive sample to reduce to half of its original mass.
The time for half of a radioactive sample to lose its radioactivity.
4. The isotope uranium-232 has a half-life of 68.9 years. How long will it take for 60% (N/N0 = 0.60) of the original sample to decay?
5.8 years
50.8 years
93.5 years
407 years
5. The isotope barium-133 has a half-life of 10.51 years. Of a 10 kg sample, how much will remain after 50 years?
0.37kg
4.53kg
8.64kg
270kg
6. A piece of bone from a horse found in an archaeological site is dated using carbon-14 dating. It is found that the bone has 78% of the carbon-14 that it would have when the horse was alive. Approximately how long ago did the horse die?
900 years ago
2,000 years ago
14,100 years ago
35,800 years ago
7. At an physics research facility 0.0027 kg of a new isotope is made in an atomic collider. After 6 seconds, 0.00147 kg remain. What is the half-life of the isotope?
0.25 seconds
5.26 seconds
6.84 seconds
500 seconds
Answers
4. 10% of 232 is 23.2 times 6 equals 139.2
68.9 x6 equals 413.4
5. 0.37kg
6. 2000 years
7. 6.84 seconds
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What perspective of dream interpretation is being offered?
A. Freudian
B. activation-synthesis
C. Jungian
D. motivation
Answers
Answer:
Freudian
Explanation:
Answer:
Freudian
Explanation:
Answers
Answers
Answer:
3.75m/s²
Explanation:
g= GM/r²
For planet 1
= GM/r² (i)
= 15m/s²
for planet 2
radius= 2*r= 2r
g= GM/r
= GM/(2r)²
= GM/4r²
= GM/r² *1/4
from (i)
=
*1/4
= 15/4
= 3.75m/s²
b.) Biodiversity and ecosystem will both decrease in the future.
c.) Biodiversity will decrease and ecosystem health will increase in the future.
d.) Biodiversity will increase and ecosystem health will decrease in the future.
Answers
Answers
Jet stream runs along the top of the troposphere as a high-speed, narrow air current flowing from west to east.
The "jet stream" is the narrow, high-speed tropospheric air current that flows west to east. The jet stream is a major atmospheric phenomena that occurs between 9 and 16 kilometres above the Earth's surface. Cold polar air and warmer equatorial air cause it. The jet stream's meandering route can affect weather patterns, storm movement, and large-scale weather. The jet stream's behaviour affects travel schedules and fuel efficiency, thus meteorologists use it to anticipate weather.
"Jet stream." The jet stream is a narrow, high-speed air movement that sweeps along the troposphere's top 9–16 kilometres (30,000–50,000 feet) above Earth. It shapes weather patterns and influences weather systems worldwide as it moves west to east. The jet stream affects temperature, precipitation, and atmospheric conditions, thus meteorologists study it to predict weather changes.
To know more about troposphere
#SPJ6
Complete quesion:- "What runs along the top of the troposphere and is a high-speed, narrow air current flowing from west to east?"
B. 9.8 kPa
C.39.2 kPa
D. 4.0 kPa
Answers
Answer
C.39.2 kPa
Explanation
The pressure in liquids depend on the depth or what we call the liquid column(h), the density of the liquid(σ) and the the acceleration due to gravity(g).
h = 4.00 m
σ = 1000 Kg/m³
g = 9.8m/s²
Pressure Is given by;
P = σgh
= 1000 × 9.8 × 4
= 39200 Pa
=39.2 KPa