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3 years ago

9

Considerando la luz como una onda, si un rayo de luz láser pasa del aire a un vidrio transparente, ¿Cuál de las siguientes carac

terísticas permanece siempre invariable?
a) Su longitud de onda.
b) Su frecuencia.
c) Su rapidez.
d) Su intensidad

1 answer:

Ivanshal [37]3 years ago

8 0

Su frecuencia permanece inalterada, pero su longitud de onda disminuye. Así que su respuesta es b) su frecuencia

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4 years ago

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3 years ago

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andriy [413]

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$\rm KE\pm \Delta KE = 17.6\pm 6.8\ J.$

Explanation:

<u>Given:</u>

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Velocity, $\rm v\pm \Delta v = 5.2\pm 0.2\ m/s.$

where,

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$\rm KE = \dfrac 12 mv^2 = \dfrac 12 \times 1.3\times 5.2^2=17.576\approx 17.6\ J.$

The uncertainty in kinetic energy is given as:

$\rm \dfrac{\Delta KE}{KE}=\dfrac{\Delta m}{m}+\dfrac{2\Delta v}{v}\\\dfrac{\Delta KE}{17.6}=\dfrac{0.4}{1.3}+\dfrac{2\times 0.2}{5.2}\\\dfrac{\Delta KE}{17.6}=0.384\\\Rightarrow \Delta KE = 17.6\times 0.384 = 6.7854\ J\approx6.8\ J\\\\Thus,\\\\KE\pm \Delta KE = 17.6\pm 6.8\ J.$

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4 years ago