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3 years ago

I need help on 7 and 8 thanks

Physics

1 answer:

Sauron [17]3 years ago

5 0

8. 107.1 MHz

7. 90.5 MHz

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A. What quantum number of the hydrogen atom comes closest to giving a 61-nm-diameter electron orbit?

Black_prince [1.1K]

Answer:

$n = 23$

$v = 87377.95 \ m/s$

Explanation:

From the question we are told that

The diameter is $d = 61\ nm = 61 *10^{-9} \ m$

Generally the radius electron orbit is mathematically represented as

$r = \frac{61 *10^{-9}}{2}$

=> $r = 3.05*10^{-8} \ m$

This radius can also be represented mathematically as

$r = n^2 * a_o$

Here n is the quantum number and $a_o$ is the Bohr radius with a value

$a_o = 0.0529 *10^{-9} \ m$

$n = \sqrt{\frac{3.05*10^{-8}}{ 0.059*10^{-9}} }$

=> $n = 23$

Generally the angular momentum of the electron is mathematically represented as

$L = m * v * r = \frac{n * h }{2 \pi}$

Here h is the Planck constant and the value is $h = 6.626*10^{-34} J \cdot s$

m is the mass of the electron with values $m = 9.1*10^{-31} \ kg$

$v = \frac{23 * 6.626*10^{-34} }{2\pi * 9.1 *10^{-31} * 3.05*10^{-8} }$

$v = 87377.95 \ m/s$

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3 years ago

What information does the atomic mass of an element provide?

andriy [413]

C
The atomic mass is the sum of the number of neutrons and protons.

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2 years ago

Complete the statement below.

nikklg [1K]

Answer:

Explanation:

Hydrogen and hydroxide ions reacts to form water in a neutralisation reaction

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3 years ago

Read 2 more answers

Estimate the inductance L of a coil that is 12 cm long, made of about 235 copper-wire turns and a diameter of about 1.7 cm. Show

ANTONII [103]

Answer:

Inductance as calculated is 13.12 mH

Solution:

As per the question:

Length of the coil, l = 12 cm = 0.12 m

Diameter, d = 1.7 cm = 0.017 m

No. of turns, N = 235

Now,

Area of cross-section of the wire, A = $\frac{\pi d^{2}}{4} = \frac{\pi \times 0.017^{2}}{4} = 2.269\times 10^{- 4}\ m^{2}$

We know that the inductance of the coil is given by the formula:

$L = \frac{mu_{o}AN^{2}}{l} = \frac{4\pi \times 10^{- 7}\times 2.269\times 10^{- 4}\times 235^{2}}{0.12} = 1.312\times 10^{- 4}\ H = 13.12\ mH$

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2 years ago

Which material produces static charge when rubbed?

natita [175]

Many materials produce static charge

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3 years ago