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Alborosie
4 years ago
5

The electromagnetic spectrum consists of various ranges of electromagnetic waves. Between which of the following does the visibl

e portion of the electromagnetic spectrum fall?
A. between the radio and microwave ranges
B. between the microwave and infrared ranges
C. between the x-ray and gamma ray ranges
D. between the infrared and ultraviolet ranges
Physics
1 answer:
lisabon 2012 [21]4 years ago
7 0
The answer is D, it falls between the infrared and ultraviolet.
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In the most common isotope of Hydrogen the nucleus is made out of a single proton. When this Hydrogen atom is neutral, a single
FinnZ [79.3K]

Answer:

The ratio of electric force to the gravitational force is 2.27\times 10^{39}

Explanation:

It is given that,

Distance between electron and proton, r=4.53\ A=4.53\times 10^{-10}\ m

Electric force is given by :

F_e=k\dfrac{q_1q_2}{r^2}

Gravitational force is given by :

F_g=G\dfrac{m_1m_2}{r^2}

Where

m_1 is mass of electron, m_1=9.1\times 10^{-31}\ kg

m_2 is mass of proton, m_2=1.67\times 10^{-27}\ kg

q_1 is charge on electron, q_1=-1.6\times 10^{-19}\ kg

q_2 is charge on proton, q_2=1.6\times 10^{-19}\ kg

\dfrac{F_e}{F_g}=\dfrac{kq_1q_2}{Gm_1m_2}

\dfrac{F_e}{F_g}=\dfrac{9\times 10^9\times (1.6\times 10^{-19})^2}{6.67\times 10^{-11}\times 9.1\times 10^{-31}\times 1.67\times 10^{-27}}

\dfrac{F_e}{F_g}=2.27\times 10^{39}

So, the ratio of electric force to the gravitational force is 2.27\times 10^{39}. Hence, this is the required solution.

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If a string completes 500 vibrations in one second, what is its frequency?
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Answer:

500 Hz

Explanation:

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