## Sapling homework Question 5

$c=\lambda v$

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Jaclyn Dang 3B
Posts: 72
Joined: Wed Sep 30, 2020 10:02 pm

### Sapling homework Question 5

Can anyone tell me what I am doing wrong in this problem? I keep trying it but it comes up as incorrect

A liquid is exposed to infrared radiation with a wavelength of 5.56x10^-4 cm. Assume that all the radiation is absorbed and converted to heat. How many photons are required for the liquid to absorb 46.36 J of heat?

Step 1:
E=(hc)/ wavelength

((6.626x10^-34)(3.00x10^8))/(5.56x10^-7)
= 3.58x10^-19

Step 2:
46.36/(3.58x10^-19)
=1.30x10^20

I've tried entering in but all are wrong please help :(
1.30x10^20
1.298x10^20
1.3x10^20

Andreas Krumbein 1L
Posts: 59
Joined: Wed Sep 30, 2020 10:00 pm

### Re: Sapling homework Question 5

5.56x10^-4 cm converted to meters is 5.56x10^-6 m, not 5.56x10^-7 m, since you're converting to cm to m, instead of mm to m. So the answer at the end of step one will be 3.58x10^-20.

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