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4 years ago

How old is the moon!

Physics

2 answers:

Tatiana [17]4 years ago

6 0

Answer:

4.53 billion years old

Explanation:

<u>Moon is considered to be formed about 60 million years later to the formation of the solar system. </u>The rocks brought from surface of moon suggest its age to be about<u> 4.53 billion years. </u>The Giant-impact hypothesis suggests that moon was formed when a Mars sized object collided with the Earth, the debris accreted to from the moon.

wolverine [178]4 years ago

5 0

4.53 billion years

1.653 trillion days

39.68 trillion hours

2.381 × 10^15 minutes

1.429 × 10^17 seconds

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Answer:

C. The atom loses 1 electron to have a total of 36.

Explanation:

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The number of electrons in a Rubidium atom is 37. If the atom loses 1 electron, then it has 36 left.

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3 years ago

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The wavelength of violet light is about 425 nm (1 nanometer = 1 × 10−9 m). what are the frequency and period of the light waves?

BigorU [14]

1. Frequency: $7.06\cdot 10^{14} Hz$

The frequency of a light wave is given by:

$f=\frac{c}{\lambda}$

where

$c=3\cdot 10^{-8} m/s$ is the speed of light

$\lambda$ is the wavelength of the wave

In this problem, we have light with wavelength

$\lambda=425 nm=425\cdot 10^{-9} m$

Substituting into the equation, we find the frequency:

$f=\frac{c}{\lambda}=\frac{3\cdot 10^{-8} m/s}{425\cdot 10^{-9} m}=7.06\cdot 10^{14} Hz$

2. Period: $1.42 \cdot 10^{-15}s$

The period of a wave is equal to the reciprocal of the frequency:

$T=\frac{1}{f}$

The frequency of this light wave is $7.06\cdot 10^{14} Hz$ (found in the previous exercise), so the period is:

$T=\frac{1}{f}=\frac{1}{7.06\cdot 10^{14} Hz}=1.42\cdot 10^{-15} s$

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3 years ago

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The mass of an object is 275.32g and its density is 7.562g/cm 3 . Calculate its volume by keeping significant figures in view.

Genrish500 [490]

Answer:

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Explanation:

Since we acknowledge that density is d= m/v, once we switch it up to maintain v as the number to be found it will change to v=m/d. Therefore, 275.32/7.562 is 36.408 and the unit is cm cube!

Hope that helped!!

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4 years ago