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larisa86 [58]
3 years ago
12

Select the statement that correctly describes how light travels. (2 points) Select one:

Physics
2 answers:
Sindrei [870]3 years ago
7 0
The correct answer is C - <span>The speed of light, traveling in a vacuum, will not change if the light source is moving. </span>
exis [7]3 years ago
6 0

The correct answer is c

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What potential difference is required in an electron microscope to give an electron wavelength of 4. 5 nm?
Lorico [155]

Potential difference required in an electron microscope to give an electron wavelength of 4. 5 nm will be 0.063 V.

The difference in potential between two points that represents the work involved or the energy released in the transfer of a unit quantity of electricity from one point to the other is called potential difference.

The wavelength of an electron is calculated for a given energy (accelerating voltage) by using the de Broglie relation between the momentum p and the wavelength λ of an electron

lambda = 4.5 nm = 4.5 * 10^{-9} m

h = 6.626 * 10^{-34}  J s

e = 1.6 * 10^{-19} C

m = 9.1 * 10^{-31} kg

Energy = eV

lambda = h / \sqrt{2mE} = h / \sqrt{2m(eV)}

(lambda)^{2} = h^{2} / (2m (eV))

V = h^{2} / (2 m e  (lambda)^{2} )

V  =  (6.626 * 10^{-34} )^{2} /  2 * 9.1 * 10^{-31} *  1.6 * 10^{-19}  * (4.9 * 10^{-9}) ^{2}

V = 0.063 V

To learn more about wavelength of an electron  here

brainly.com/question/17295250

#SPJ4

7 0
2 years ago
In a pool game, the cue ball, which has an initial speed of 3.0 m/s, make an elastic collision with the eight ball, which is ini
zhenek [66]

Explanation:

Given

initial speed(u)=3 m/s

mass of each ball is m

Let the cue ball is moving in x direction initially

In elastic collision Energy and momentum is conserved

Let u be the initial velocity and v_1 , v_2 be the final velocity of 8 ball and cue ball respectively

\frac{mu^2}{2}+0=\frac{mv^2_1}{2}+\frac{mv^2_2}{2}

The angle after which cue ball is deflected is given by

\theta _1=90-40=50^{\circ}

Conserving momentum in x direction

mu=mv_1cos40+mv_2cos50

3=v_1cos40+v_2cos50

Along Y axis

0+0=v_1sin40-v_2sin50

v_1sin40=v_2sin50

substitute the value of v_1

we get v_2=1.912 m/s

v_1=2.27 m/s

5 0
3 years ago
What do we mean by the interstellar medium?
Sphinxa [80]
<h2>Answer:</h2>

The <u>interstellar medium</u> is the content of matter and energy that exists between stars within a galaxy.

In this sense, two components can be distinguished in the interstellar medium: dust particles and gas.

Dust represents 1% of the interstellar medium in mass, while the gas (consisting mainly of hydrogen and helium) represents 99% of the mass of the interstellar medium.

It should be noted that the interstellar matter is not uniformly distributed but is concentrated in molecular clouds.

3 0
3 years ago
Determine the number of bonding electrons and the number of nonbonding electrons in the structure of of2.
Gnoma [55]
OF2 - 
<span>O has 6 electrons in outer shell and F has 7 in its outer shell </span>
<span>Therefore, you have to account for 20 electrons total in the </span>
<span>structure (7+7+6 = 20) </span>
<span>therefore draw it linear first. F ---- O-----F </span>
<span>The two bonds take care of 4 electrons now you have to add another 16. </span>
<span>Therefore 3 lone pairs on each F and 2 lone pair on O. </span>
<span>If you check for formal charges, all the atoms are neutral </span>
<span>F will have 3 lone pairs + 1 bond = 7 electrons (bond = 1/2 electron for formal charge distribution) therefore both the F's are neutral </span>
<span>Now look at the O: it should have 6.. it has two lone pair and 2 bonds = 4 electrons and 2 bonds = 1 electron each = 2 electrons from bonds = 6 total electrons for formal charge which is exactly the # it should have. There is no need for any double bond in this as there are no charges to be separated. </span>
<span>Now if u look at the # of domains around O you will see if you include the lone pairs it has a sp3 hybridization (4 domains) therefore a tetrahedron which has 2 lone pairs and 2 bonds.. since there are two lone pairs, the lone pair/bond pair repulsion is so high it is going to repel the two Fluorines and form a bent structure, looks a lot like H2O. </span>
4 0
3 years ago
Read 2 more answers
Help me in this please help me!
Eddi Din [679]

Answer:

1. A

2. C

3. A

4. B

Explanation:

A conductor allows electric current to pass through it. Hence, when conductors are connected in a closed circuit, current flows.

All the resistors in Q2 are connected in series. In a series connection, the current across all the resistors is the same.

In a battery, chemical energy is converted to electrical energy by chemical reactions.

When a new resistor is connected in parallel to a circuit the current increases accordingly.

3 0
3 years ago
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