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3 years ago

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Many scientists believe the solar system formed _______________ago, Question 1 options: over 4.5 billion years under 1 billion y

ears over 500 billion years under 2.5 billion years

1 answer:

klio [65]3 years ago

3 0

4.5 billion years ago according to science

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Lightsail-2 is a spacecraft launched in June 2019 by the Planetary Society driven by radiation pressure on a solar sail of area

lozanna [386]

Answer:

$2.655\times 10^{13}\ photons$

Explanation:

Area of the solar sail = A = 30 m2

Solar constant = I = 1388 W/m2

Planck's constant = h = 6.626 × 10⁻³⁴ m²kg/s

Speed of light = c = 3×10⁸ m/s

Wavelength of light = $\lambda$ = 570 nm

Pressure from radiation

$P=2\frac{I}{c}\\\Rightarrow P=2\frac{1388}{3\times 10^8}\\\Rightarrow P=9.253\times 10^{-6}\ W$

Energy of a photon

$E=\frac{hc}{\lambda}\\\Rightarrow E=\frac{6.626\times 10^{-34}\times 3\times 10^8}{570\times 10^{-9}}\\\Rightarrow E=3.487\times 10^{-19}\ J$

Number of photons

$n=\frac{P}{E}\\\Rightarrow n=\frac{9.253\times 10^{-6}}{3.487\times 10^{-19}}\\\Rightarrow n=2.655\times 10^{13}\ photons$

Number of photons is $2.655\times 10^{13}\ photons$

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3 years ago

Ostrovityanka [42]

Answer:I think the answer is 5.43 I don’t rlly know

Explanation:

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3 years ago

Explain why liquids solidify when they are cooled.

Setler [38]

Because the molecules that move freely begin to compact closer together, with less heat, means less molecular activity.

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Choose the correct association for: dense bushes<br><br> savanna<br> rain forest or jungle

Gemiola [76]

Answer:

Climate is determined by averaging the seasonal weather conditions for a region over a period of many ______ years

Choose the correct association for: dense bushes rain forest or jungle

Choose the correct association for: plains savanna

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2 years ago

a man can swim in still water with speed of 2kmhr-1 wants to cross a river 200m wide flowing with 1kmhr-1 . Calculate the time t

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Answer:

d savage

Explanation:

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3 years ago