Question

Calculate the frequency and time period of an electromagnetic wave whose wave number is 7.8 m–1

also calculate the energy associated with the given electromagnetic wave​​
plss help me with this guys...
its very urgent

Answer 1

Answer:

(i) The frequency of the light wave is

period

1

=

2.0×10

−10

s

1

=5×10

9

/s.

The energy is 53 Joules

Explanation:

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Answer 2

Explanation:

$\dfrac{1}{λ}=7.8\: m^{-1}$

$λ=\dfrac{1}{7.8}= 0.128 \: m$

$frequency = \dfrac{c}{λ}=\dfrac{3×10^8}{0.128}$

$= 2.34×10^9 \: Hz$

Time period = 1/frequency

$= \dfrac{1}{2.34×10^9}$

$= 4.27×10^{-10} \: s$