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photoshop1234 [79]
3 years ago
15

Orbit around hub and arms of spirals ( with name )

Physics
1 answer:
const2013 [10]3 years ago
6 0
 the answer is the Spiral Galaxy
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What do repeated trails in an experiment allow scientists to do?
fredd [130]

Answer:

Explanation:

When we do multiple trials of the same experiment, we can make sure that our results are consistent and not altered by random events. Multiple trials can be done at one time. If we were testing a new fertilizer, we could test it on lots of individual plants at the same time.

3 0
3 years ago
Consider an electron in an infinite well of width 0.7 nm . What is the wavelength of a photon emitted when the electron in the i
ollegr [7]

Answer:

 λ  = 538.0 nm

Explanation:

The solution of the Schrödinger equation for the inner part of the well gives energy

      E_{n} = (h² / 8mL²) n²

Where n is an integer and L is the length of the well

They ask for the transition from the first excited state n = 2 to the base state n = 1

       E₂ - E₁ = = (h² / 8mL²) (n₂² - n₁²)

Let's calculate

       E₂-E₁ = (6.63 10⁻³⁴)² / (8 9.1 10⁻³¹ (0.7 10⁻⁹)²) (2² -1²)

       E₂ –E₁ = 3.6968 10⁻¹⁹ J

Let's use the Planck equation

      E = h f

      c = λ f

      E = h c / λ

      E = E₂ ₂- E₁

      h c / λ  = 3.6968 10⁻¹⁹

      λ  = h c / (E₂-E₁)

      λ  = 6.63 10⁻³⁴ 3 10⁸ / 3.6968 10⁻¹⁹

      λ  = 5.380 10⁻⁷ m

Let's reduce

      λ  = 5.380 10⁻⁷ m (10 9 nm / 1 m)

      λ  = 538.0 nm

4 0
4 years ago
The green book is 30 cm long, 15 cm wide and 3 cm high. What is the Volume?
MAVERICK [17]

Answer: 1,350cm³

Explanation:

Volume = LWH

= 30 × 15 × 3 = <u>1</u>,<u>350cm</u>³

4 0
3 years ago
HELP.
Radda [10]

-- <em>Mechanical waves DO</em> require a medium in order to travel from place to place.  (Sound can't travel without some material to travel through on the way.)

-- <em>Electromagnetic waves do NOT</em> need a medium in order to travel from place to place.  (Sunlight reaches us from the Sun without anything to travel through on the way.)

6 0
3 years ago
Two objects, object X and Object Y, are held together by a light string
Vinil7 [7]

Answer:

This question is incomplete

Explanation:

The completed question is in the attachment to this question

The two objects (X and Y) at rest had a potential energy of Mx.gH and My.gH respectively because the formula for potential energy (P.E) is mgh. Where m is the mass of the object, g is acceleration due to gravity and h is the height of the object above the ground. Hence, Mx and My are the masses of X and Y respectively.

The change in there potential energy to kinetic energy and back to there potential energy will be

P.E of Y - P.E of X (because mass of Y is larger and will hit the floor first)

Hence, My.gH - Mx.gH ⇔ (My - Mx)gH

Correct option is C

7 0
3 years ago
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