3 years ago

The scale most widely used by scientist for measuring earth quakes is called what

Chemistry

2 answers:

DanielleElmas [232]3 years ago

8 0

A sesimograph or a sesimogram.

S_A_V [24]3 years ago

5 0

Its actually called a Richter scale.

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Why is it not possible to directly count the number of particles in a mole?

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Answer: because a mole is based on Avogrado's number, which is 6.02 x 10²³ particles. It isn't possible to directly count that many particles at a time.

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3 years ago

Why is melting an ice cube a reversible physical change?

Dmitriy789 [7]

Answer:

Because you can freeze the water you melted back into a ice cube.

Explanation:

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When an electron in a 2p orbital of a particular atom makes a transition to the 2s orbital, a photon of approximate wavelength 6

Mariulka [41]

Answer:

The energy difference between these 2p and 2s orbitals is $3.07\times 10^{-19} J$

Explanation:

Wavelength of the photon emitted = $\lambda =646.3 nm =646.3\times 10^{-9} m$

Energy of the photon will corresponds to the energy difference between 2p and 2s orbital = E

Energy of the photon is given by Planck's equation:

$E=\frac{hc}{\lambda }$

h = Planck's constant = $6.626\tiomes 10^{-34} Js$

c = Speed of the light = $3\times 10^8 m/s$

$E=\frac{6.626\tiomes 10^{-34} Js\times 3\times 10^8 m/s}{646.3\times 10^{-9} m}$

$E=3.07\times 10^{-19} J$

The energy difference between these 2p and 2s orbitals is $3.07\times 10^{-19} J$

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3 years ago

Where does the Sun’s light come from and why does it look different at different times of the day?

Contact [7]

Answer:

Sun light comes from the sun which is a part of our solar system

and it look different because the earth is spinning so the angle will can and that will determine if the sun rays will get light or darker

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3 years ago

Answer question 13. What is the mechanical advantage of a lever that can lift a 100 N load with a input force of 20 N

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MA= output force/ input force
MA= 100N/20N
MA= 50

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3 years ago