Question

If the wavelength of green light is about $5000 \AA$, what is its frequency? ( $c = 3.0 \times 10^{8} ms^{-1}$)

Answer 1

"Given,  

Wavelength of green light = 5000 \AA.  

Frequency = ?

$c\quad =\quad 3\quad \times \quad { 10 }^{ 8 }\quad m/s$

We know that, wavelength $= 5000 \AA = 5000 x 10-10$

We know, $Frequency\quad =\quad \frac { c }{\lambda}$

$=\quad \frac { 3\quad \times \quad { 10 }^{ 8 } }{ 5000\quad \times \quad { 10 }^{ -10 } }$

$Frequency =\quad 0.0006\quad \times \quad { 10 }^{ 18 }$

$Frequency\quad =\quad 0.6\quad \times \quad { 10 }^{ 15 }\quad Hz$"

Answer 2

Answer:

f×λ=C

f=

5000×10

−10

m

3×10

8

m/s

=6×10

14

sec

−1