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Serhud [2]
3 years ago
5

If a hydrogen atom has its electron in the n= 4 state, how much energy in eV is needed to ionize it?

Physics
1 answer:
ololo11 [35]3 years ago
4 0

Answer:

Explanation:

Energy of electron in n = 4 state

= - 13.6/4² =- 0.85 eV

So energy needed to extract it from atom = .85 eV.

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The wavelength of a certain portion of an electromagnetic wave is 314 nm. what is its frequency and classification?
nadezda [96]

The frequency of the electromagnetic wave is 9.55 × 1014 Hz and it is classified as ultraviolet.

<h3>What is meant by electromagnetic waves?</h3>

Electromagnetic waves are forms of energy that are invisible and travel throughout the universe. However, some of the effects of this energy are visible. The light that we see is a component of the electromagnetic spectrum.

Electromagnetic waves, or EM waves, are produced by vibrations between an electric field and a magnetic field. In other words, electromagnetic waves are made up of oscillating magnetic and electric fields.

<h3>How do you calculate the speed of an electromagnetic wave?</h3>

The wavelength and frequency of any periodic wave are used to calculate its speed. v = λf.

In free space, the speed of any electromagnetic wave is equal to the speed of light, c = 3 *108 m/s.

The frequency of the electromagnetic wave is 9.55 × 1014 Hz and it is classified as ultraviolet.

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2 years ago
What is the biggest star in our solar system?
WARRIOR [948]
The Biggest star in our universe is the sun. Although the largest in the galaxy is the <span>VY Canis Majoris which is about 3,900 to 5000 light years away from us.</span>
5 0
4 years ago
Read 2 more answers
A circular loop of radius 0.0400 m is
Alenkinab [10]

Let's see

Find enclosed area of loop

\\ \rm\dashrightarrow \pi r^2

\\ \rm\dashrightarrow 3.14(0.04)^2

\\ \rm\dashrightarrow 0.005m^2

Now

\\ \rm\dashrightarrow \phi=BAcos\theta

  • We need B

\\ \rm\dashrightarrow 9.59\times 10^{-7}=B(0.005)cos75

\\ \rm\dashrightarrow 9.59\times 10^{-7}=0.0046B

\\ \rm\dashrightarrow B=2084.78\times 10^{-7}

\\ \rm\dashrightarrow B=2.08\times 10^{-4}T

\\ \rm\dashrightarrow B=0.208mT

4 0
2 years ago
Warm air rising is part of a __________________________ current.
adelina 88 [10]

Answer:

Thermal

Explanation:

4 0
3 years ago
. In the following three arrangements each resistor has the same resistance R. Rank the equivalent resistances of the arrangemen
Natali5045456 [20]

Answer:

Explanation:

15 ) Current_rms = Peak current / √2

= 6 / √2

= 4.24 A

Voltage_rms = 4.1 / √2

= 2.9 v

Average power = Voltage_rms x Current_rms

= 2.9 x 4.24

= 12.3 W

16 ) R₂ = 2R₁

Resistance of a material changes due to change in resistivity of material .

So resistivity ρ₂ will also be twice resistivity ρ₁

ρ₂  = 2ρ₁

2ρ₁ = ρ₁ ( 1 + .0035 t ) where t is rise in temperature.

1 = .0035 t

t = 1 / .0035

= 285.7 ⁰ C

6 0
3 years ago
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