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3 years ago

The vending of light when it changes media is called

1 answer:

6 0

I think you meant bending :).
Anyway when light enters a different medium the bending of light is refraction. Depending on the medium (i.e if it is denser or rarer) it will bend light closer or away from the normal ray (i.e a ray that hits the medium at 90 degrees does not bend).
Hope this helps :).

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The planets move around the stars in different orbits .which planet will have the shortest of revolution (year)?

Ivahew [28]

4 because it's closest to the star

3 0

3 years ago

Which Lewis dot diagram shows an atom that needs 2 more electrons in its outermost shell?

sergiy2304 [10]

Answer: Option (c) is the correct answer.

Explanation:

Atomic number of hydrogen is 1 and one dot in its lewis structure displays only one electron. So, in order to complete its octet it needs one more electron.

Atomic number of carbon is 6 and its electronic distribution is 2, 4. Carbon needs 4 more electrons in order to complete its octet.

Atomic number of oxygen is 8 and its electronic distribution is 2, 6. In order to complete octet, oxygen needs 2 more electrons.

Atomic number of fluorine is 9 and its electronic distribution is 2, 7. In order to complete octet, fluorine needs 1 more electron.

Hence, we can conclude that out of the given options, lewis dot structure of oxygen atom needs 2 more electrons in its outermost shell.

8 0

4 years ago

Read 2 more answers

3. Suppose that an airplane flying 60 m/s, at a height of 300m, dropped a sack of flour (pere the effect

Arlecino [84]

469.24m. An airplane flying 60m/s at a height of 300m dropped a sack of flour that stack the ground 469.24m from the point of release.

This is a example of horizontal parabolic projectile motion,and we represents this motion in the coordinate axis, which means that the velocity has components in x axis and y axis.

The equation of components on the x axis.

$v_{0}x=\frac{x}{t}$ , where x is the distance and Vox the initial velocity before the drop

The equation of components on the y axis.

$y = v_{0}yt+\frac{gt^{2} }{2}$ , where y is the height, and the velocity in y component before the drop is 0, reducing the equation to $y = \frac{gt^{2} }{2}$

Clear t from both the equation of components on the x axis and the y axis:

$t=\frac{x}{v_{0} x}$ and $t=\sqrt{\frac{2h}{g}}$

Equating both equations and clearing the distance x:

$\frac{x}{v_{0} x}=\sqrt{\frac{2h}{g}}\\x={v_{0} x}\sqrt{\frac{2h}{g}}$

Substituting the values:

$x=60\frac{m}{s} \sqrt{\frac{2(300m)}{9.81\frac{m}{s^{2} } }}=469.24m$

3 0

3 years ago

Risks are only in a persons mind would know from facts to back them up

lyudmila [28]

Risks are only in a persons

8 0

4 years ago

. Using your knowledge of circular (centripetal) motion, derive an equation for the radius r of the circular path that electrons

Ronch [10]

Answer:

Explanation:

Magnetic field creates a force perpendicular to a moving charge in its field which is equal to Bev where B is magnetic field , e is amount of charge on the moving charge and v is the velocity of charge particle .

This force provides centripetal force for creation of circular motion. If r be the radius of the circular path

Bev = mv² / r

r = mv / Be

2 ) If an electron is accelerated by an electric field created by potential difference V then electric field

= V / d where d is distance between two points having potential difference v .

force on charged particle

electric field x charge

= V /d x e

work done by field

= force x distance

= V /d x e x d

V e

This is equal to kinetic energy created

V e = 1/2 mv²

= 1/2 m (r²B²e² / m² )

V = r²B²e/ 2 m

e / m = 2 V/ r²B²

3 )

B = $\frac{\mu\times I\times R^2}{2(R^2+Z^2)^\frac{3}{2} }$

In Helmholtz coils , distance between coil is equal to R so Z = R/2

B = $\frac{\mu\times I\times R^2}{2(R^2+\frac{R^2}{4} )^\frac{3}{2} }$

For N turns of coil and total field due to two coils

B = $\frac{\mu\times I\times N}{R\times(\frac{5}{4})^\frac{3}{2} }$

= $\frac{\mu\times I\times N}{R}\times (\frac{4}{5})^\frac{3}{2}$

= 9.0 x 10^-7 NI/R

8 0

4 years ago