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mestny [16]
3 years ago
5

What is the half-life of Technetium-99 if a 200 gram sample decays to 50 grams in 639,000 years?

Chemistry
1 answer:
Elenna [48]3 years ago
5 0

Answer:

The half-life of Th-232 is 1.4 ∙ 10¹⁰ years.

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Two basic properties of the gas phase are
Molodets [167]
The choices can be found elsewhere and as follows:

A.) a definite shape and a definite volume
B.) a definite shape but no definite volume
C.) no definite shape and no definite volume

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6 0
4 years ago
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a television remote control operates at 319 THz, what is the wavelength of the infrared light in nanometers?
AURORKA [14]

<u>Given:</u>

Frequency (ν) = 319 THz

<u>To determine:</u>

The wavelength corresponding to the given frequency

<u>Explanation:</u>

Wavelength (λ) and Frequency(ν) are related as:

λ = c/ν

where c = speed of light = 3*10⁸ m/s

Now:

SI unit of frequency is Hertz (Hz) also expressed as cycles per second

i.e 1 Hz = 1 s⁻¹

1 Terahertz (THz) = 10¹² Hz

therefore the given frequency ν = 319 *10¹² s⁻¹

λ = 3 * 10⁸ ms⁻¹/319 *10¹² s⁻¹ = 940 * 10⁻⁹ m

since 1 nanometer (nm) = 10⁻⁹ m

The wavelength is λ = 940 nm

Ans: The infrared wavelength = 940 nm

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The nearest whole number of 99.59
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It is 100 because a 5 and up means you round up. also the 9 makes it a 6 rounded up
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Ulleksa [173]

Answer:

I don't get it is it even a question?

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Mineral oil dissolves in hexane but not in ethanol
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