Question

The red light from a He-Ne (helium-neon) laser has a wavelength of 633 nm. What is the frequency of the light?

A. 4.7 × 10^14 Hz

B. 4.7 × 10^5 Hz

C. 190 Hz

D. 1.9 × 10^11 Hz

Answer 1

it is simple, since we have to apply this formula:
\[\Large \lambda \nu = c\]

Answer 2

okay!! what do we plug in? :/

Answer 3

here is the computation:
\[\Large \nu = \frac{c}{\lambda } = \frac{{3 \times {{10}^{10}}}}{{6.33 \times {{10}^{ - 7}}}}\]

Answer 4

okay!! and so we get 4.739336493E16 ?

Answer 5

where I have used these values:
c=3*10^10 cm/sec
\lambda=633*10^-9 meters = 6.33*10^-7 meters=6.33*1^-5 cm

Answer 6

ahh okie!

Answer 7

and so our solution is choice A?

Answer 8

please wait, I have made an error, here is the right computation:
\[\Large \nu = \frac{c}{\lambda } = \frac{{3 \times {{10}^{10}}}}{{6.33 \times {{10}^{ - 5}}}}\]

Answer 9

ohh okay!! so we get 4.739336493E14?

so that is choice A still? :P

Answer 10

ok!

Answer 11

that's right! It is option A

Answer 12

yay!! thank you!!

Answer 13

since the wave length is:
633 nm= 6.33*10^-5 cm

Answer 14

:)

Answer 15

thank you!! :)