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4 years ago

Which is most likely true about electronegativity?

2 answers:

3 0

It tends to increase across a period.
This is visible in the first period, where Nitrogen is less electronegative than Oxygen which is less electronegative than Fluorine.

AnnyKZ [126]4 years ago

3 0

Answer:

It tends to increase across a period.

Explanation:

Electronegativity is the tendency of an atom in a bond pair to attract the shared pair of electron towards itself.

Low ionization energies as well as low electron affinities mean the atom has low effective nuclear charge, which results in the less attraction of the valence electrons by the atom and thus, low electronegativity.

Thus, across the period, electronegativity increases and down the group, it decreases.

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PLZ HELP WILL GIVE BRAINLIEST

xxTIMURxx [149]

Answer:

12.7m/s

Explanation:

Given parameters:

Mass of the diver = 77kg

Height = 8.18m

Unknown:

Final velocity = ?

Solution:

To solve this problem, we use one of the motion equations.

v² = u² + 2gh

v is the final velocity

u is the initial velocity

g is the acceleration due to gravity

h is the height

v² = 0² + (2 x 9.8 x 8.18)

v² = 160.3

v = 12.7m/s

7 0

3 years ago

A standard biological microscope is required to have a magnification of 200Ã. what is the focal length of the objective?

NISA [10]

Answer:

The focal length of the objective is L/20.

Explanation:

Given that,

Magnification of the standard biological microscope, m = 200

Let the magnification of the eyepiece is, $m_e=10$

Let $m_o$ is the magnification of objective lens. The formula of the magnification is given by :

$M=m_o\times m_e\\\\200=m_o\times 10\\\\m_o=20$

The formula of the magnification is given by :

$M=\dfrac{L}{f_o}m_e$

L is length of microscope

$f_o$ is focal length of the objective

$f_o=\dfrac{Lm_e}{M}\\\\f_o=\dfrac{10L}{200}\\\\f_o=\dfrac{L}{20}$

So, the focal length of the objective is L/20.

7 0

3 years ago

How much time is required for reflected sunlight to travel from the Moon to Earth if the distance between Earth and the Moon is

NISA [10]

The amount of time required for reflected sunlight to travel from the moon to the earth according to the given distance between then and the speed of light is; 1.28 seconds.

<h3>How long does it take reflected sunlight to each the earth from the moon?</h3>

It follows from the task content that the time required for the reflected sunlight to reach the earth can be evaluated if the speed of light is known in which case, the speed of light, c = 3× 10⁸ m/s.

Consequently, we have time taken, t evaluated as follows;

Time taken, t = distance/speed

t = 3.85 ×10⁵ × 10³/3× 10⁸

t = 3.85/3

t = 1.28 seconds.