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konstantin123 [22]
3 years ago
7

What types of elements are useful for dating materials?

Physics
2 answers:
Alekssandra [29.7K]3 years ago
4 0

the nswer is for sure radioactive

Semenov [28]3 years ago
3 0
Well im not sure if this is the correct dating materials but here are some examples of Fundamentals of radiometric dating<span>Radioactive decay.
Accuracy of radiometric dating.
Closure temperature.
The age equation.
Uranium–lead dating method.
Samarium–neodymium dating method.
Potassium–argon dating method.
<span>Rubidium–strontium dating method.</span></span>
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In si units, the electric field in an electromagnetic wave is described by ey = 104 sin(1.40 107x − ωt). (a) find the amplitude
melamori03 [73]
Answers:
(a) B_o  = 0.3466μT
(b) \lambda = 0.4488μm
(c) f = 6.68 * 10^{14}Hz

Explanation:
Given electric field(in y direction) equation:
E_y = 104sin(1.40 * 10^7 x -\omega t)

(a) The amplitude of electric field is E_o = 104. Hence

The amplitude of magnetic field oscillations is B_o =  \frac{E_o}{c}
Where c = speed of light

Therefore,
B_o =  \frac{104}{3*10^8} = 0.3466μT (Where T is in seconds--signifies the oscillations)

(b) To find the wavelength use:
\frac{2 \pi }{\lambda} = 1.40 * 10^7
\lambda =  \frac{2 \pi}{1.40} * 10^{-7}
\lambda =  0.4488μm

(c) Since c = fλ
=> f = c/λ

Now plug-in the values
f = (3*10^8)/(0.4488*10^-6)
f = 6.68 * 10^{14}Hz


6 0
3 years ago
What is the impulse needed to stop a 45-kg boy who is running at 6 m/s in 3 seconds?
Tju [1.3M]
Impulse = change of momentum
Impulse = 45 x 6 = 270 Ns
6 0
3 years ago
Which statement most completely describes a Lewis electron dot diagram? A.
andrezito [222]

Answer:

i do not know

Explanation:

5 0
2 years ago
Read 2 more answers
When two different species compete for resources, it is______ competition.
Katen [24]

Answer:

it is a interspecific competition

Explanation:

i just took a test with this question

4 0
3 years ago
A mass of 100 g stretches a spring 5 cm. If the mass is set in motion from its equilibrium position with a downward velocity of
garri49 [273]

Answer:

w_{0}=14

t=\frac{\pi }{14}

Explanation:

<u>Data</u>

<u>mass m= 100g</u>

<u>Length L= 5cm</u>

<u>we can use:</u>

<u>gm-kL= 0</u>

<u>divide both side by m</u>

<u>g - </u>\frac{kL}{m}<u>=0</u>

<u>where</u>

\frac{k}{m} = \frac{g}{L}

\frac{k}{m}=w_{0}^{2}

so now

w_{0}^{2} = \frac{9.8*100}{5}

w_{0}^{2}=\frac{980}{5}

w_{0}^{2}=196

square both side

w_{0}=\sqrt{196}

w_{0}=14

We can apply:

u(t)=Acoswt +Bsinwt

u(t)=Acos14t +Bsin14t

u(0)=0  where A=0

therefore

u(0) = Bsin14t  

u^{'}(0) = 10 ⇒ 10=14B ⇒ B=\frac{14}{10} B=\frac{5}{7}

so now u(t)=\frac{5}{7}sin14t

so t will be:

t=\frac{\pi }{14}

t=\frac{3.14}{14}

t=0.22 seconds

8 0
3 years ago
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