3 years ago

Which best describes the climate of Antarctica?

Chemistry

2 answers:

Nadya [2.5K]3 years ago

7 0

The coldest place on earth

Contact [7]3 years ago

4 0

Answer:

Explanation:

Antarctica is the coldest place on earth because of the lack of sunlight it receives.

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If Sally has 250 grams of cement, how many kilograms does she have? How many milligrams?

MissTica

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PLEASE HELP!?Consumers must eat other organisms for energy. Which organisms are consumers in this food chain?

Vitek1552 [10]

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2 years ago

One of the emission spectral lines for Be3+ has a wavelength of 253.4 nm for an electronic transition that begins in the state w

4vir4ik [10]

Answer:

Explanation:

Relationship between wavenumber and Rydberg constant (R) is as follows:

$wave\ number=R\times Z^2\frac{1}{n_1^2} -\frac{1}{n_1^2}$

Here, Z is atomic number.

R=109677 cm^-1

Wavenumber is related with wavelength as follows:

wavenumber = 1/wavelength

wavelength = 253.4 nm

$wavenumber=\frac{1}{253.4\times 10^{-9}} \\=39463.3\ cm^{-1}$

Z fro Be = 4

$39463.3=109677\times 4^2(\frac{1}{n_1^2} -\frac{1}{5^2})\\39463.3=109677\times 16(\frac{1}{n_1^2} -\frac{1}{5^2})\\n_1=4$

Therefore, the principal quantum number corresponding to the given emission is 4.

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3 years ago