## Wavelength unit conversion

Stephen Sirmay 1I
Posts: 30
Joined: Fri Sep 28, 2018 12:21 am
Been upvoted: 1 time

### Wavelength unit conversion

When calculating wavelength using the formula wavelength= h/(mass x velocity), I'm uncertain what units my given mass should be? I noticed that the Joules contains the units kg, so would that mean my mass needs to be in units of kg to cancel out, resulting in a end result unit of wavelength mass? Or does it not matter at all?

Christine Chen 1H
Posts: 64
Joined: Fri Sep 28, 2018 12:18 am

### Re: Wavelength unit conversion

Mass needs to be in kg to cancel out! The only time you would use grams is for molar mass conversions. Other than that, use kg.

Rachel Dang 1H
Posts: 32
Joined: Fri Sep 28, 2018 12:17 am

### Re: Wavelength unit conversion

Yup, whenever doing calculations involving units make sure you have ones that allow you to cancel out what you don't need while ending up with the correct units for your answer. So yes in that case you would need mass in kg.

Posts: 30
Joined: Fri Sep 28, 2018 12:27 am

### Re: Wavelength unit conversion

What's the ratio of kg in a joule for the conversion?

Jovian Cheung 1K
Posts: 48
Joined: Fri Sep 28, 2018 12:16 am

### Re: Wavelength unit conversion

1 joule = 1 kg•m2•s-2 in SI units! :o)