Question

the wave length range of visible spectrum extents from violet to red (400nm-750nm) express this wave length in frequency​

Answer 1

Explanation:

Frequencyofvioletlight,

v=

λ

c

=

400×10

−9

m

3.00×10

8

ms

−1

=7.50×10

14

Hz

Frequencyofredlight,

v=

λ

c

=

680×10

−9

m

3.00×10

8

ms

−1

=4.41×10

14

Hz

Answer 2

Answer:

speed of a wave = 3*10^8(c)

speed or vel. =frequency*wavelenght

3*10^8 m/s=400nm*wavelenght

1 nm= 10^-9m

3*10^8 m/s=400*10^-9m*wavelenght

3*10^8 m/s=4*10^-7*wavelenght

7.5*10^16

in same way,

3*10^8 m/s=750*10^-9m*wavelenght

4*10^14