Question #6734d

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Question #6734d

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Answer 1 · 2018-01-01T07:34:17

$4.56 \times 10^{8} Hz$ $4.56 xx 10^8 "Hz"$

Explanation:

We know,

$c = ν λ$ $c = nulambda$ [For an electromagnetic wave]

Where,

$c$ $c$ = velocity of the wave = $2.998 \times 10^{8} {m.s}^{-1}$ $2.998 xx 10^8 "m.s"^"-1"$
$ν$ $nu$ = frequency of the wave and
$λ$ $lambda$ = wavelength of the wave.

According to the question,

$2.998 xx 10^8 color(red)(cancel(color(black)("m")))."s"^"-1" = 657 xx 10^"-3" color(red)(cancel(color(black)("m"))) xx nu$

$nu = 4.56 xx 10^8 "Hz"$

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Question #6734d

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