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3 years ago

Which two elements have similar properties and 8 electrons in their outermost shells?

Physics

2 answers:

Lemur [1.5K]3 years ago

5 0

Answer:

D. Krypton and Xenon

Explanation:

Kamila [148]3 years ago

4 0

Answer:

Its D Kr and Xe

Explanation:

Element from the same group have simmilar properties

If you now the atomic number ،its so easy to know how much electrons they have in outermost shell.

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A bat, flying at 5.00 m/s, emits a chirp at 40.0 kHz. If this sound pulse is reflected by a wall, what is the frequency of the e

fredd [130]

Answer:

The answer is below

Explanation:

Firstly, the frequency is received by the wall and then it is reflected and received by the bat.

The frequency received by the wall (f') is given by:

f' = $f(v\pm v_o)/v\\\\$

The - sign is used when the observer is moving away from the source and + sign when the observer is moving towards the source.

Since the bat is moving towards the wall, we use a positive sign. Hence:

f' = $f(v+ v_o)/v\\\\$

The frequency reflected and received by the bat f" is:

f'' = $f'\frac{v}{ (v\pm v_s)}\\\\$

- sign is used when the source moves toward the observer and + is used when the source moves away

since the bat moves towards the wall, then::

f'' = $f'\frac{v}{(v-v_s)} =\frac{f(v+v_o)}{v}*\frac{v}{(v-v_s)} =f\frac{(v+v_o)}{(v-v_s)} \\\\$

v = speed of sound in air = 331 m/s, vo = velocity of observer = 5 m/s, vs = velocity of source = 5 m/s. Therefore:

$f"=f\frac{(v+v_o)}{(v-v_s)} =40\ kHz\frac{(331\ m/s+5\ m/s)}{(331\ m/s+5\ m/s)} \\\\f"=41\ kHz$

3 0

3 years ago

A driver of a car traveling at -15m/s applies the brakes, causing a uniform acceleration of +2.0m/s2. If the brakes are applied

klemol [59]

Given :

Initial velocity, u = -15 m/s.

Acceleration , a = 2 m/s².

Time taken to applied brake, t = 2.5 s.

To Find :

The velocity of the car at the end of the braking period.

How far has the car moved during the braking period.

Solution :

By equation :

$v = u+at\\\\v=-15 + 2\times 2.5\\\\v=-10 \ m/s$

Now, distance covered by car is :

$s=ut+\dfrac{at^2}{2}\\\\s=(-15)(2.5)+\dfrac{2(2.5)^2}{2}\\\\s=-31.25\ m$

Hence, this is the required solution.

3 0

4 years ago

In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a reaction

Crazy boy [7]

Redox reactions( oxidation-reduction reaction)

6 0

3 years ago

Find the wavelength of light given off by a hydrogen atom when its electron drops from the n = 4 to n = 1 energy level

4vir4ik [10]

Answer: 1.55 x 10 -19J on top

Explanation:

4 0

3 years ago

Imagine you are a passenger in a car and you are looking out the window. A car is in the lane next to you facing the same direct

lutik1710 [3]

Answer:

First possibility is that while changing radio station, the car had overtaken, or either you slowed down and you let the car get in front of you, either intentionally or non-intentionally.

Explanation:

These are tree possibilities I mentioned above.

Give me Brainliest.

8 0

3 years ago

Read 2 more answers