Question

WILL FAN AND MEDAL

The wavelength of a specific photon in the infrared spectrum is
4 × 10^-6 meters. Given that the speed of light is 2.998 × 10^8 m/s, what would be the frequency of this infrared wave?

11.992*10^2 Hz

0.7495*10^-14 Hz

11.992 * 10^-2 Hz

0.7495 * 10^14 Hz

Answer 1

speed of light = wavelength x frequency

frequency = speed of light/ wavelength

do the math!!

Answer 2

@Cuanchi if I knew how to do the math I wouldn't be on here

Answer 3

@whateven we need to understand the units first, I agree with what @Cuanchi said

Answer 4

speed of light is m/s and the wavelength is in meters.

Answer 5

This is what my question is I can't change it and if I don't answer correctly my gpa goes down

Answer 6

let's take @Cuanchi's formula

\[\frac{ speed of light }{ wavelength } = \frac{ m/s }{ m } = \frac{ 1}{ s } = frequency\]

all you need to do is plug in the numbers.

Answer 7

I don't know where to plug them in and get a result that matches my choices that's the problem

Answer 8

The units are
wavelength = meters
speed of light = meters/ seconds
frequency = 1/seconds
you dont need to do any conversion of units, just apply the formula that correlate the speed of light with the wavelength and the frequency

Answer 9

\[\frac{ 1 }{ s } = hertz \]

Answer 10

it is a simple division of the value of speed of light divided by the wavelenght

Answer 11

Hz = 1/seconds = 1/s

Answer 12

plug the numbers in and tell us what you get before you submit your answer

Answer 13

This still isn't helping. I plug it in like you say and my calculator says syntax error ?

Answer 14

2.998 × 10^8 m/s /4 × 10^-6 meters= x.xxx 10^xx

Answer 15

that's what i typed in. It said syntax error

Answer 16

@whateven use ( ) around the numbers like this \[\frac{ (2.99x10^{8}) m/s }{ (4.0x10^{-6})m }= Hz \]

Answer 17

You can also enter this in on a scientific calculator online

Answer 18

7.495*10^13 so something is wrong @photon336

Answer 19

????

Answer 20

That's correct,

Answer 21

but in the answers they wrote it strangely, if you moved the decimal place in the 7.4 1 over to the right what answer choice would you get?

Answer 22

The last one?

Answer 23

yeah that's it

Answer 24

Thanks!