# Homework Help: Different frequency units?

1. Dec 3, 2005

### asdf1

for the frequency of revolution of electrons, the unit is expressed as rev/s
but for the frequency of a photon, the unit is hz

my question:
can rev/s also equal hz?

2. Dec 3, 2005

### Pengwuino

Well frequency is really just s^-1

Saying the "frequency of revolution" however qualifies the "rev/s" because you have frequency... "/s"... and revolutions "rev".

3. Dec 3, 2005

### ZapperZ

Staff Emeritus
Yes it can. 1 rev/sec is equal to 2pi rad/sec. This is angular frequency. If you look in elementary texts on circular motion, there's a directly relationship between angular frequency and the "usual" frequency.

Zz.

4. Dec 3, 2005

### asdf1

so if i see frequency, i can just use hertz, right?

5. Dec 3, 2005

### FredGarvin

You will also see cycles/sec a lot of times for units of frequency.

6. Dec 3, 2005

### lightgrav

Hz is any COUNT per second ... your computer uses Mega "pulses per second", because its clock oscillates with a lot of "oscillations per second" , and the microwave oven produces even more "waves per second".

7. Dec 4, 2005

### asdf1

thank you very much!!!