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faltersainse [42]
3 years ago
12

A quantum of electromagnetic radiation has an energy of 2.0 kev. what is its frequency? planck's constant is 6.63 × 10−34 j · s.

answer in units of hz.
Physics
1 answer:
xxMikexx [17]3 years ago
8 0
A quantum of electromagnetic radiation is called photon, and the energy of a photon is given by
E=hf (1)
where h is the Planck constant and f is the frequency of the photon.

In this problem, the photon energy is
E=2.0 keV=2.0 \cdot 10^3 eV=3.2 \cdot 10^{-16} J
If we re-arrange equation (1), we can find the energy of the photon:
f= \frac{E}{h}= \frac{3.2 \cdot 10^{-16} J}{6.6 \cdot 10^{-34} Js}=4.8\cdot 10^{17} Hz
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Given the data in the question;

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Therefore;

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Age\ of\ Universe; t = \frac{1}{H_0}\\\\t = \frac{1}{ 5.39 *10^{-18}s^{-1}} \\\\t = 1.855 * 10^{17}s\\\\We\ convert\ to\ years\\\\t =  \frac{ 1.855 * 10^{17}}{60*60*24*365}yrs \\\\t = \frac{ 1.855 * 10^{17}}{31536000}yrs\\\\t = 5.88 *10^9 years

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Learn more: brainly.com/question/14019680

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