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Zepler [3.9K]
3 years ago
11

What is focusingHelp me please​

Physics
1 answer:
sveticcg [70]3 years ago
4 0
Focusing means you’re paying particular attention to something
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-4.5 m\s indicates that an object is traveling
a_sh-v [17]
Neither the opposite direction (left) or its slowing down. Hope this helps
8 0
4 years ago
Derive the velocity of an electron in a hydrogen atom using Bohr's model. The electron has a mass of m, charge of (-e) and an or
Ahat [919]

Answer:

v=\frac{Ze^2}{2 \epsilon_0\times n\times h}

v=\frac {2.185\times 10^6}{n}\ m/s

Explanation:

According to Bohr's Theory,

The force of attraction acting between the electron and the nucleus is equal to the centrifugal force acting on the electron.

Thus,

\frac{Ze^2}{4\pi \epsilon_0 r^2}=m_e\frac{v^2}{r} ......1

Where, Z is the atomic number or the number of protons

r is the atomic radius

v is the velocity of the electron

m_e is the mass of the electron

Also,

Accoriding to Bohr, the angular momentum is quantized. He states that the angular momemtum is equal to the integral multiple of \frac {h}{2\times \pi}.

m_e vr=n\times \frac {h}{2\times \pi} ....2

solving r from equation 2, we get that:

r=n\times \frac {h}{2\times \pi\times m_e v}

Putting in 1 , we get that:

v=\frac{Ze^2}{2 \epsilon_0\times n\times h}

Applying values for hydrogen atom,

Z = 1

Mass of the electron (m_e) is 9.1093×10⁻³¹ kg

Charge of electron (e) is 1.60217662 × 10⁻¹⁹ C

\epsilon_0 = 8.854×10⁻¹² C² N⁻¹ m⁻²

h is Plank's constant having value = 6.626×10⁻³⁴ m² kg / s

We get that:

v=\frac {2.185\times 10^6}{n}\ m/s

4 0
4 years ago
A plane mirror forms a virtual image why​
Debora [2.8K]
Light rays from the object strike the mirror and reflect according to the law of reflection. This image is called a virtual image because the light does not actually pass through the image. Because the rays of light never meet at a real focus and the image cannot be obtained on a screen
7 0
3 years ago
A car decelerates uniformly from 54 m/s to 38 m/s in 8.0 seconds. How far does it travel dunng this time?
galina1969 [7]

Answer:

368m

Explanation:

dx=vt

54+38/2=46

46*8=368m

7 0
3 years ago
Which material produces static charge when rubbed?
natita [175]
Many materials produce static charge

5 0
3 years ago
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