The amount left of a radioactive sample amount N0 if the decay constant is 0.00125 seconds and the time is 180 seconds is 0.7999 N.
What is half-life?The time it takes for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life T1/2 and the decay constant is given by T1/2 = 0.693/λ.
N=N0e−λtgiven λ = 0.00125 secondst = 180 secondsNow putting values.N=N0e−λt = 0.799N= 0.7999.Read more about the radioactive :
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Which of the following statements is true about two objects in thermal equilibrium
Answer:
the last statement is the true one
A stationary body is acted upon by a number of forces. State the two conditions which must apply for the body to remain at rest.
Answer:
1. All the externally applied forces were cancelled out.
2. The externally applied force is not exceeded the limiting friction
Explanation:
165=4+(10)T Write answer nearest tenth place
Answer:
16.1
Explanation:
165 = 4 + ( 10 ) T
165 = 4 + 10T
Subtract 4 on both sides,
165 - 4 = 10T
161 = 10T
10T = 161
Divide 10 on both sides,
T = 161 / 10
T = 16.1
Please help !! With my hw
Covert the grams into kilograms.
Explanation:
Well the formula for Ke is simply 1/2(mv^2)
So by the use of SI units- (i.e. kg for mass and m/s for velocity) Hector could easily compute Ke
Gamma radiation is a type of __________ radiation of a very high frequency. What one word completes the sentence?
Answer:
I think your answer is: Electromagnetic!
Please mark brainliest! Have a nice day! :)
Gamma radiation is a type of electromagnetic radiation of a very high frequency.
What are the Gamma radiations?Gamma radiations are high-energy electromagnetic radiation that is emitted by an atomic nucleus undergoing radioactive decay.
The energy associated with subatomic particles that are emitted during the decay of unstable atomic nuclei is known as radiation. There are three forms of radiation which are Alpha (α) radiation, Beta (β) radiation, and Gamma (γ) radiation.
Gamma radiations are extremely high-frequency radiation containing high-energy photons. Gamma rays are capable enough of releasing electrons from atoms causing their ionizing in nature. Gamma radiation is used in the treatment of cancer as the cancerous tumor undergoes gamma radiation, which kills its DNA.
Gamma rays can cause animal cells to decay so they are biologically dangerous. Gamma rays have wavelengths of less than 10 picometers and frequencies of above 10 exahertz. Gamma rays need a special kind of detector, known as a gamma rays telescope.
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describe how the volume of a floating object such as a cork can be found.fully describe please step by step.
Answer:
Explanation:
Use Archimedes' principle, that states something of this nature: "The buoyant force acting on an object immersed in a fluid is equal to the weight of the fluid displaced"
Say, you take a cube of wood(for example) and place it in a bucket of water. Your cube is bound to sink, until, the upthrust force equals its weight.
Where does this upthrust come from?
As the cube sinks, it displaced some volume of water(if the bucket were full you would see water pouring out)
Archimedes simply stated that: Upthrust,
U=mg
Example: One way to measure the volume of any irregular object (in your case, a stone) is to submerge it completely under water and measure the change in the height of the water level. This change in the water level (let's say it goes from 50 mL to 65 mL) indicates that the stone has a volume of 15 mL.Example:Subtract the first volume from the second volume to calculate the volume of the stone. For example, if you recorded 40 fluid ounces the first time, and 50 fluid ounces the second time, the stone volume is 10 fluid ounces.a car on the motorway is accelerating at 25ft/sec. if it started from rest and has been accelerating for 5 sec. how far has it travelled during this time of acceleration?
Answer:
312.5 ft
Explanation:
x = xo + vo t + 1/2 a t^2 xo = 0 v0 = 0
x = 1/2 a t^2 = 1/2 (25)(5^2) = 312.5 ft
A football filled with air is left outside on a hot, sunny day. If no air leaks out of the ball, what will happen to the air molecules inside the ball?
A. They will start moving faster.
B. They will decrease in number.
C. They will start moving slower.
D. They will increase in number.
Answer:
A. They will start to move faster
Explanation
The kinetic energy of the air molecules increases thus the molecules vibrate faster
Answer:
They will start to move faster.
Explanation:
As temperature increases the motion of molecules also increases!
Hope that helps :)
The chart shows characteristics of stars. A 3 column table with 7 rows. The first column is labeled color with entries red, orange, yellow to white, white, white to blue, blue, blue. The second column is labeled surface temperature in Kelvin with entries greater than 25000, 11000 to 25000, 7500 to 11000, 6000 to 7500, 5000 to 6000, 3500 to 5000, under 3500. The last column is labeled average mass in solar mass units with entries 60, 18, 3.2, 1.7, 1.1, 0.8, 0.3. Sirius is a blue-white star with a surface temperature of about 9800 K. What is most likely the mass of Sirius? 1.0 solar mass 1.4 solar mass 2.0 solar mass 12 solar mass
Sirius is a blue-white star, expressing -1.5 magnitude, 9800ºK of temperature, and located 8.6 light-years from the Earth. Its mass is 2 solar mass. Option C.
What is Sirius?
Sirius seems to be one of the most brilliant stars in the sky. It shines with a magnitude of -1.5, being only superated by the moon, the sun, and some planets -Venus and Jupiter-.
Sirius is a blue-white star, 25 times more luminous than the sun, its mass is twice the sun's mass, and its temperature reaches approximately 10000 K. It is the fifth star closer to the Earth, located at a distance of 8.6 light-years.
Sirion is visible from almost every place around the world, excepting latitudes higher than 73º N. It can be seen in the Canis Major constellation. It is also easily identified by looking down from the Orion belt.
Color Surface temperature (ºK) Average mass
red > 25000 60
orange 11000 to 25000 18
yellow-white 7500 to 11000 3.2
white 6000 to 7500 1.7
blue-white 5000 to 6000 1.1
blue 3500 to 5000 0.8
blue < 3500 0.3
According to this chart and the provided information, the mass of this blue-white star shoud be between 1.1 and 3.2 solar mass units.
To make a better estimation of the Sirus mass, we can make use of the following formula,
(M/M₀)²'⁵ = (T/T₀)⁴
This formula describes the relationship between the mass and temperature of the sun and of another star.
Where,
M ⇒ Mass of the other starM₀ ⇒ Mass of the sun ⇒ 1 solar mass.T ⇒ Temperature of the other star ⇒ 9800K T₀ ⇒ Temperature of the sun ⇒ 5778K(M/M₀)²'⁵ = (T/T₀)⁴
(M/M₀)²'⁵ = (9800K/5778K)⁴
(M/M₀)²'⁵ = (1.696)⁴
(M/M₀)²'⁵ = 8.27
(M/M₀) = ²'⁵√8.27
(M/M₀) = 2328
M = 2328 x 1 solar mass
M = 2328 solar mass
According to this formula, we might say that the mass of the Sirus star is around 2 solar mass. Option C.
As said before in the introduction, Sirius mass is aproximately twice the sun mass.
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the thermal energy of what system does change
Answer:
there is the increase the temperature of cold body and decrease the temperature of hot body
the quantity that can be zero if body remains in motion for some time
Answer:
ok I think sooo
Explanation:
Velocity and displacement
Earth quakes near the California Bay typically occur at frequencies of 1.5HZ or 2.8HZ. If you were engineering a new building in that area, choose the natural frequency you would want your building to have so that it would be least likely to collapse during an Earthquake.
a. 2.0 Hz
b. 1.6 Hz
c. 2.7 Hz
Answer:
2.0 Hz
Explanation:
2.0 Hz is the most closest to the middle number in between 2.8 and 1.5 Hz. 1.6 Hz would not be suitable as it is too close to 1.5 Hz and 2.7 would also not be suitable as it is too close to 2.8 Hz.
A car travels at 20 m/s. On the other side of the road another car travels towards it at 15 m/s. What is their relative velocity in m/s?
Answer:
35 m/s
Explanation:
Which system is responsible for receiving senses throughout the body?
a optical system
b endocrine system
c nervous system
d circulatory system
Answer:
The correct answer is C NERVOS SYSTEM as it allow ALLL the sense to work
Explanation:
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Pigment capable
of absorbing
Yellow green blue indigo and violet
what are the advantages and disadvantages of specific heat capacity
Answer:
Explanation:
what are the advantages and disadvantages of specific heat capacity
