Heating 235 g of water from 22.6 degrees C to 94.4 degrees C in a microwave oven requires 7.06x10^4 J of energy. If the microwave frequency is 2.88x10^10 Hz, how many quanta are required to supply the 7.06x10^4 J?

Guidelines.

I don’t mean to be the bearer of bad news…

I won’t do your homework (and no one else will), but you should know that the temperatures are not relavent to the solution. This should be a matter of calculating the energy of the frequency and dividing.

Any more help I give you would involve me telling you the page number to read.

Not asking for you to do it. and i know that the temperature isn’t relevant just want some help such as a formula I’m forgetting or something? such as how many hertz it takes for a joule?

Your textbook, if it’s worth what you paid for it, will provide you with the tools to solve the problem, in the section that you just covered. If it doesn’t, consider mail-bombing the publisher.

Google does a lot these days; you might consider running your simple questions through it.

Tried that.. Also I totally agree on the textbook comment but I searched through it and couldn’t find it. My friend couldn’t either, and our teacher doesn’t like going over work. Seems this one will just escape me.

Here’s the hint… You need to use Planck’s Constant.