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OLga [1]
3 years ago
15

Roughly how many stars are in the Milky Way Galaxy?

Physics
2 answers:
svetlana [45]3 years ago
7 0

Answer:

there are many stars in the milky way galaky

Explanation:

uncountable stars

Masja [62]3 years ago
7 0

Answer:

there are 100 billion to 400 billion star in milky way galaxy

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What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?
ivann1987 [24]

Answer:

2.46\cdot 10^5 J

Explanation:

The energy of a single photon is given by:

E=\frac{hc}{\lambda}

where

h is the Planck constant

c is the speed of light

\lambda is the wavelength

For the photon in this problem,

\lambda=486 nm=4.86\cdot 10^{-7}m

So, its energy is

E_1=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{4.86\cdot 10^{-7}m}=4.09\cdot 10^{-19} J

One mole of photons contains a number of photons equal to Avogadro number:

N_A = 6.022\cdot 10^{23}

So, the total energy of one mole of photons is

E=N_A E_1 = (6.022\cdot 10^{23})(4.09\cdot 10^{-19} J)=2.46\cdot 10^5 J

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3 years ago
A biologist formulates a hypothesis, performs experiments to test his hypothesis, makes careful observations, and keeps accurate
SVEN [57.7K]
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3 years ago
Calculate the potential difference across a 10 ohm register carrying a current of 2.5 ampere​
Bas_tet [7]

Answer:

using ohm's law

V=IR

V= 10 X 0.2

V = 2 Volt.

Explanation:

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Sarah is looking for a way to move her boat across the water without touching it directly. She included paperclips in the boat d
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Answer:

When there is no detergent in the water, you'll achieve a floating paper clip!

Explanation:

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