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IRISSAK [1]
3 years ago
8

The hydrogen-line emission spectrum includes a line at a wavelength of 434 nm. What is the energy of this radiation? (h= 6.626 x

10 ⁻³⁴ J * 8 )
SHOW WORK
Chemistry
1 answer:
Andrews [41]3 years ago
6 0
Wavelength = 434nm = 434 x 10⁻⁹m
planck's constant = <span>h= 6.626 x 10 ⁻³⁴ J
E =?
by using the formula;
E = hc /</span>λ
value for c is 3 x 10⁸ m/s
E = (6.626 x 10 ⁻³⁴ J)(3 x 10⁸ m/s) / 434 x 10⁻⁹m
E = 1.9878 x 10⁻²⁵ / 434 x 10⁻⁹m
E = 4.58 x 10⁻¹⁹ joules

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The half-life of cesium-137 is 30 years. Suppose we have a 150 mg sample. The masses (in mg) that remains after t years A=150/2^t/30yrs

<h3>what do you mean by half-life?</h3>

A substance's half-life is the amount of time it takes for half of it to decompose.

<h3>What is a half-life example?</h3>

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