Answer:
Từ ánh sáng từ mặt trời đến nhiệt liên tục phát ra từ cơ thể chúng ta, có nhiều dạng bức xạ khác nhau. Tuy nhiên, khi nói đến bức xạ và nguy cơ ung thư, hầu hết mọi người đều nghĩ đến tia X và tia gamma.
Các nguồn tự nhiên của tia X và tia gamma bao gồm khí radon, chất phóng xạ trong lòng đất và các tia vũ trụ tấn công hành tinh từ không gian. Tuy nhiên, loại bức xạ này cũng có thể do con người gây ra. Tia X và tia gamma được sản xuất trong các nhà máy điện hạt nhân để sử dụng trong các xét nghiệm hình ảnh y tế, điều trị ung thư, chiếu xạ thực phẩm và máy quét an ninh sân bay với liều lượng nhỏ.
English:
From light from the sun to the heat that is continuously emitted from our bodies, there are many different forms of radiation. However, when it comes to radiation and cancer risk, most people think of X-rays and gamma rays.
Natural sources of X-rays and gamma rays include radon gas, underground radioactive material, and cosmic rays that strike the planet from space. However, this type of radiation can also be caused by humans. X-rays and gamma rays are produced in nuclear power plants for use in medical imaging tests, cancer treatments, food irradiation and airport security scanners in small doses.
Can someone one help me please !!!
Answer:
Current in the circuit(I) = 0.5 ampere
Explanation:
Given:
Number of resistors = 2 (10 ohm each)
Series of resistors
EMF = 10 volt
Find:
Current in the circuit(I)
Computation:
Total resistance in series = R1 + R2
Total resistance in series = 10 + 10
Total resistance in series = 20 ohm
Current in the circuit(I) = EMF / Total resistance in series
Current in the circuit(I) = 10 / 20
Current in the circuit(I) = 0.5 ampere
A hydraulic jack is used to lift a car by applying a force of 120N at the pump piston,if the area of the ram and pump piston are 100cm squared and 1m squared respectively
Complete question:
A hydraulic jack is used to lift a car by applying a force of 120N at the pump piston, if the area of the ram and pump piston are 100cm squared and 1m squared respectively. What is the weight of the car?
Answer:
the weight of the car is 1.2 N
Explanation:
Given;
applied force, F₁ = 120 N
area of the effort (pump), A₁ = 1 m²
area of the load (ram), A₂ = 100 cm² = 1 x 10⁻² m²
let the weight of the car = F₂
The applied pressure is constant and the following equations can be used to calculate the weight of the car.
[tex]P = \frac{F_1}{A_1} = \frac{F_2}{A_2} \\\\F_2 = \frac{F_1 \times A_2}{A_1} \\\\F_2 = \frac{120 \times (1\times 10^{-2})}{1} \\\\F_2 = 1.2 \ N[/tex]
Therefore, the weight of the car is 1.2 N
What fraction of a wavelength of a standing wave pattern is between resonances in a closed end tube?
Answer:
[tex]25\%[/tex] of the wavelength is between resonances in a closed end tube.
Explanation:
In an one end closed tube, the fundamental resonance occurs when a node is created at the closed end and an antinode is created in the open end.
Thus, for fundamental resonance, the entire length of the tube encloses one-fourth of the wavelength of the standing wave.
The formula to calculate the percentage of the wavelength in a closed end tube is given by
[tex]f=\frac{L}{\lambda}\times100\%........................(1)[/tex]
Here, [tex]f[/tex] is the required percentage, [tex]L[/tex] is the length of the tube and [tex]\lambda[/tex] is the wavelength of the standing wave.
Substitute [tex]\frac{\lambda}{4}[/tex] for [tex]L[/tex] into equation (1) o calculate the required percentage.
[tex]f=\dfrac{\frac{\lambda}{4}}{\lambda}\times100\%\\~~~=25\%[/tex]
describe one example of light being refracted in the living room
Answer:
television
Explanation:
a television refracts light (the light bounces off of the screen
Answer:
Suppose you have a glass slab as a paper weight, if you keep it on the paper, dont you see something strange? The paper becomes elevated in the glase slab. Everyone sees a waterbottle or glass everyday, while seeing through it, does everything seem normal? Nope. That's refraction.
Explanation:
You must have seen a prism, right? It makes light split into the visible electromagnetic spectrum.
Which symbol represents a type of radiation that has the same mass as an
electron and a positive charge?
Answer:
the answer is D
as an electron is composed of positive charges
Answer:
D.+1°e symbol represents a type of radiation that has the same mass as an electron and a positive charge.
Explanation:
it is 100% correct!
I need help QUICK!! 20 points
Which of the following is/are formed as gravity pulls increasing amounts of dust and debris in a nebula together?
a. the solar wind
b. meteors
c. planetesimals
d. meteorites
I need helpppp please
Answer:
b
Explanation:
Q2. A cube of side 2 cm has a density of 6 g cm. What is the mass of the cube?
[tex]given \: the \: length \: of \: one \: side \: of \: a \: cube \: \\ = 2cm \\ so \: we \: know \: the \: volume \: of \: a \: cube \: = {side}^{3} \\ so \: the \: volume \: of \: the \: cube \: here \: = {2}^{3} {cm}^{3} = \: 8 {cm}^{3} \\ we \: know \: density \: of \: a \: substance \: = \: \frac{mass}{volume} \\so \: mass \: = density \times volume \\ density = 6 \frac{g}{ {cm}^{3} } \\ volume \: = 8 {cm}^{3} \\ so \: \: mass \: = (6 \times 8)( {cm}^{3} \times \frac{g}{ {cm}^{3} }) \\ 48gram \: (ans) [/tex]
HOPE IT HELPS
Explain how a truss bridge is so stable.
Answer:
Truss bridge, bridge with its load-bearing structures composed of a series of wooden or metal triangles, known as trusses. Given that a triangle cannot be distorted by stress, a truss gives a stable form capable of supporting considerable external loads over a large span.
Explanation:
Load-bearing capacity of truss bridges is huge due to the structure of interconnecting triangles. The structure effectively manages both compression and tension by spreading the load from the roadway throughout its intricate structure
2.
A charge particle is moved through a potential difference of 154.5 V and experiences a
change of electric potential energy of 4.26 x 10-8 J. What is the charge of the particle?
Answer:
2.76×10⁻¹⁰ C
Explanation:
Applying,
V = W/q................... Equation 1
Where V = Electric Potential, E = Electric potential energy, q = charge.
make q the subject of the equation
q = W/V................ Equation 2
From the question,
Given: W = 4.26×10⁻⁸ J, V = 154.5 V
Substitute these values into equation 2
q = 4.26×10⁻⁸/154.5
q = 2.76×10⁻¹⁰ C
athlete running on a circular track of radius 5 m completes one round in 12 s. what its average speed and average displacement?
Average speed = total distance/time
That's 2.62 m/s .
You don't want average displacement. You want average velocity.
That's (displacement)/(time).
That's zero, because displacement = 0.
The unit of area is called derived unit, why?
Answer:
Because the unit of area depends upon the other fundamental units.
Explanation:
Unit of Area = m^2
actual metre is the unit of length.
so metre × metre makes ?^2
Which element is found in group 16 and period 5
Answer:
Po (Polonium)
Explanation:
entropy is the amount of heat a system releases. true or false?
Answer:
The answer to this is FALSE.
The source of electromagnetic waves is _____.
vibrating atoms
magnetic fields
electric fields
vibrating electric charges
Answer:
D. Electric Charges
What type of glass absorbs light and does not allow light to pass through it?
reflective
transparent
opaque
refractive
opaque glass does not allow light to pass through it.
A human hair has a thickness of about 70 micrometers. How many meters is
this?
A. 70 x 10-2 m
B. 70 x 10-6 m
C. 70 x 10-3 m
D. 70 x 10-ºm
Answer:
the answer is B. 70 x 10-6 m
Explanation:
i'm doing the test rn
When converting from micrometers to meters, you have to divide the value by 1,000,000
= 70/1000000
= 7 ×10⁻⁵
Hence the thickness of the human hair is in meters is 7×10⁻⁵ m
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Numerical: A capacitor of 200 picofarad is charged to a potential difference of 100 volts. It's plates are then connected parallel to another capacitor them potential difference in this combination fall to 60 volts. What is the capacitance of second capacitor?
(Working of this solution)
Answer:
The capacitance of the other capacitor is 1333.3 pF.
Explanation:
C' = 200 pF, V' = 100 V, C'' , V''= 0
Common potential, V = 60 V
Use the formula of the common potential
[tex]V = \frac{C' V' + C'' + V''}{C'+ C''}\\\\60 = \frac{200\times 100 + 0}{200 + C''}\\\\1200+ 6 C''= 2000\\\\C'' = 1333.3 pF[/tex]
What is the net force on the object represented by the FBD below?
Answer:
Explanation:
35 up 35 down cancel out.
25 forward minus 10 pulling back, so:
25-10
= 15N Right
The displacement ‘s' of a point moving in a straight line is given by: s = 6t^2 + 5t – 5, ‘s' being in cm and ‘t' in s. The initial velocity of the particle is:
Answer:
the initial velocity of the particle is 5 cm/s
Explanation:
Given initial displacement as, s = 6t² + 5t - 5
s is measured in "cm"
t is measured in "seconds"
Velocity is the rate of change of displacement with time. Expressed as follows;
[tex]v = \frac{ds}{dt} = 12t + 5[/tex]
for initial velocity, time (t) = 0
v = 12(0) + 5
v = 5 cm/s
Therefore, the initial velocity of the particle is 5 cm/s
A person ran westward for 1600 meters in 8 minutes. What was their speed?
Answer:
3.33 m/s
Explanation:
1600 divided by 8 comes out to 200, so supposing we're measuring the speed in terms of Meters Per Second, we would need to divide 200 by 60 to take account of the individual seconds as opposed to simply 200 meters per minute.
Electromagnetic radiation that is used by humans and animals to see is called the visible light spectrum.
Group of answer choices
True
False
Answer:
True Hope it's helpful. plz mark me as brainlist.If the angle of a light ray in air is 25∘ and it enters a substance with a refracted angle of 13∘, what is the index of refraction of the substance?
A). 0.65
B). 0.53
C). 1.92
D). 1.88
Answer:
Explanation:
The formula for this is
[tex]n_1sin\theta_1=n_2sin\theta_2[/tex] where the index of refraction of air is 1.00. Filling in and solving for n2:
1.00sin(25) = n₂sin(13) and
1.00(.423) = n₂(.225) and
[tex]\frac{1.00(.423)}{.225}=n_2[/tex] so
[tex]n_2=1.88[/tex], choice D.
define fundamental unit ? write its two example.
the International System of Units, the fundamental units are: The meter (symbol: m), used to measure length. The kilogram (symbol: kg), used to measure mass. The second (symbol: s), used to measure time. The ampere (symbol: A), used to measure electric current.
There are two sets of resistors joined in series in a circuit. Set 1 has two resistors of 10Ω and 40Ω in parallel combination. Set 2 has three resistors of 20 Ω, 30 Ω and 60 Ω in parallel combination. A potential difference of 12 V is applied across the combination.
[tex]\huge\boxed{\fcolorbox{black}{red}{ QUESTION}}[/tex]
There are two sets of resistors joined in series in a circuit. Set 1 has two resistors of 10Ω and 40Ω in parallel combination. Set 2 has three resistors of 20 Ω, 30 Ω and 60 Ω in parallel combination. A potential difference of 12 V is applied across the combination.
[tex] \orange{\underline{\huge{\bold{\textit{\green{\bf{GIVEN}}}}}}}[/tex]
Two set of Parallel resistors
Contains two resistors of --> 10Ω and 40Ω
Contains three resistors of --> 20 Ω, 30 Ω and 60Ω
Potential Difference Of 12 V
[tex]{\bold{\orange {To \: Find }}}[/tex]
Draw a circuit diagram to represent this arrangement Calculate
(a) the total resistance and
(b) the total current flowing in the circuit.
[tex] \huge\mathbb{\red A \pink{N}\purple{S} \blue{W} \orange{ER}}[/tex]
FOR DIAGRAM REFER ATTACHMENT!
[tex]{\bold{\green{\star{\red {Part \: 1:- The \: Total \: Resistance }}}}}[/tex]
First we calculate the total resistance of each parallel combination:-
FIRST SET Contains two resistors of 10Ω and 40Ω
so total resistance-->
[tex] \frac{1}{Rs1} = \frac{1}{R1} + \frac{1}{R2} \\ \\ \frac{1}{Rs1} = \frac{R1 + R2}{R1R2} \\ \\ \frac{1}{Rs1} = \frac{10 + 40}{400} \\ \\ \frac{1}{Rs1} = \frac{50}{400} \\ \\ \frac{1}{Rs1} = \frac{1}{8} \\ \\ Rs1 = 8 Ω[/tex]
SECOND SET Contains three resistors of 20 Ω, 30 Ω and 60Ω
so total resistance-->
[tex] \frac{1}{Rs2} = \frac{1}{R1} + \frac{1}{R2} + \frac{1}{R3} \\ \\ \frac{1}{Rs2} = \frac{R1 + R2 +R3}{R1R2R3} \\ \\ \frac{1}{Rs2} = \frac{3+ 2 + 1}{60} \\ \\ \frac{1}{Rs2} = \frac{6}{60} \\ \\ \frac{1}{Rs2} = \frac{1}{10} \\ \\ Rs2 = 10Ω[/tex]
Now by having Total Resistance of Set one and set two we can add them by series formula.
[tex]R = Rs1 + Rs2 \\ R = 8 + 10 = 18 \: Ω[/tex]
[tex]{\bold{\green{\star{\orange{Part \: 2:- The \: Total \: Current \: Flowing \: In \: The \: Circuit. }}}}}[/tex]
Total Resistance of the circuit = 18 Ω
Potential Difference Of the circuit = 12 V
So Total current-->
[tex] V = IR \\ 12 = 18 \times I \\ \\ I = 0.66 \: A[/tex]
NEED HELP
A 0.558 kg block of copper at 117°C comes in contact with a 1.11 kg block of aluminum at 15.8°C. What is their equilibrium temperature?
there it is fella tried on ma own consciousness
Answer:
33.8
Explanation:
(Acellus)
If each metal is hit with light at a minimum wavelength, can I vary the intensity of the light to start emitting electrons?
It is true that the metal will begin to emit electrons at varied speeds depending on the intensity of the light when it is struck at a minimal wavelength.
What is meant by wavelength?When a waveform signal is propagated in space or over a wire, the wavelength is the separation between two identical locations (adjacent crests) in the adjacent cycles.
If you are employing light with a high enough frequency, the number of electrons ejected grows as the light source's brightness rises.
The velocity of the expelled electrons increases as the frequency is raised above the threshold.
Thus, the metal will begin to emit electrons at varied speeds depending on the intensity of the light when it is struck at a minimal wavelength.
To learn more about Wavelength, refer to the below link:
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# SPJ2
What is cultural discontinuity?
Answer:
Disconnections and discrepancies
between school-based norms and values and those of
some pupils, especially those from
nondominant cultures, are referred to
as cultural discontinuity.
☆-----------------------------☆
☆Hope it helps...
☆Have a great day!!!
If 175 kJ of heat caused a chunk of ice at 0°C to melt to liquid water at 0°C, how many moles were in the ice? How many grams of ice? (Note: molar mass of ice/water is 18.02 g/mol)
Answer is 29.1 mol or 525 g
Explanation:
It costs $336.384 to run a given giant screen TV all the time for 365 days. By choosing to use your TV's power-saving feature, the average current drawn drops to 0.275 Amps on the same 120 Volt circuit. How much do you save per year by using this feature (cost per kWh is $0.20) versus leaving it on all the time?
Answer:
The amount saved in a year is $ 278.6.
Explanation:
current, I = 0.275 A
Voltage, V = 120 V
cost = $ 0.20 per kWh
The energy spent in 1 year is given by
E = V I t
E = 120 x 0.275 x 365 x 24 x 3600
E = 1.04 x 10^9 J
1 kWh = 3.6 x 10^6 J
So,
E = 288.9 kWh
So, the cost is
C = $ 0.2 x 288.9 = $ 57.78
So, the amount saved = $ 336.384 - $ 57.78 = $ 278.6