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Nimfa-mama [501]
3 years ago
14

The absorption spectrum of helium has a black vertical line at a wavelength of 502 nm. What can you conclude about atoms of heli

um?
A. They emit photons with a wavelength of 502 nm.
B. They do not emit photons with a wavelength of 502 nm.
C. They emit photons with a wavelength that is shifted slightly above 502 nm.
D. They emit photons with a wavelength that is shifted below 502nm.​
Chemistry
1 answer:
Lapatulllka [165]3 years ago
5 0

Answer:

The answer is A

Explanation:

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What type of radioactive decay will the isotopes 13B and 188Au most likely undergo?
scoundrel [369]

Answer:

b. Beta emission, beta emission

Explanation:

A factor to consider when deciding whether a particular nuclide will undergo this or that type of radioactive decay is to consider its neutron:proton ratio (N/P).

Now let us look at the N/P ratio of each atom;

For B-13, there are 8 neutrons and five protons N/P ratio = 8/5 = 1.6

For Au-188 there are 109 neutrons and 79 protons N/P ratio = 109/79=1.4

For B-13, the N/P ratio lies beyond the belt of stability hence it undergoes beta emission to decrease its N/P ratio.

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8 0
3 years ago
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3 years ago
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A student measures the mass of a 10m^3 block of gold to be 500 kg what is the density of the gold
Anuta_ua [19.1K]

Answer:

d = 50 kg/m³

Explanation:

density = \frac{mass}{volume}

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8 0
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Help please. I only need the concepts.
melomori [17]

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