# Chemistry

posted by .

I'm having a difficult time with the Conversion Units in my equation.

My cell phone has an antenna about 10.00cm long. If this is one quarter of the wavelength of the radiation, at what frequency in Megahertz does it operate? Note that cell phones, like radio, transmit sounds via electromagnetic waves which travel at the speed of light or 3x108m/s.

I know f=v/l, but Ii am having a difficult time in getting to an answer in MegaHertz.

• Chemistry -

c = speed of light = 3.00E8 m/s
f = freq is in Hz
w = wavelength in meters.
c = fw

1/4 wavelength = 10.0 cm so 1 w = 40 cm = 0.400m
f = c/w = 3.00E8/0.4 = 7.50E8 Hz.
Now you convert to the unit you want.
7.50E8 Hz x (1 MHz/10^6 Hz) = ?

• Chemistry -

Dr Bob,
Thanks for the help with the conversion. I was missing the solution on two fronts. One was the wavelength factor and the other was the MegaHertz.

Do you know where I can find more information on "wavelength of the radiation" ? There is not a lot of specific detail in my text book.
Thanks again.

• Chemistry -

No I don't, other than the obvious of using google.com. The c = fw thing I remember from freshman physics many long years ago but I've used it thousands of times. If you know that it will take you a long way in frequency/wavelength problems.

## Similar Questions

1. ### phone charges project

Okay I need to know something about cell phones and land lines. My parents can't answer this because we don't have a land line anymore. We just have cells phones. Okay my question is if someone with a cell phone calls a land line person …

3. ### chemistry

one reason carbon monoxide(CO) is toxic is that it binds to the blood protein hemoglobin more strongly than oxygen does. The bond between hemoglobin and CO absorbs radiation of 1953 cm^-1. (the units are the reciprocal of the wavelength …
4. ### Chemistry

What metal is a cell phone antenna made of?
5. ### science

One reason carbon monoxide (CO) is toxic in that it bind to the blood protein hemoglobin more strongly than oxygen does. The hemoglobin – CO bond absorbs radiation of 1953 cm–1, which are in units of wavenumbers. Wavenumber is …
6. ### science

My cell phone has an antenna about 10.00cm long. If this is one quarter of the wavelength of the radiation, at what frequency in Megahertz does it operate?
7. ### Science

1.Infrared radiation has wavelengths ranging from about 800 nm to 1 mm. What is the frequency of radiation of wavelength 970 nm?
8. ### PHYSICS

A cell phone emits signs in approximately 750 Mhz. Which is the wavelength and energy of this radiation
9. ### Physics

Hello, can someone please check my answers and tell me if they are correct?
10. ### English

1. The cell phone vibrates when somebody calls me. 2. The cell phone vibrates when someone calls me at the phone. 3. The cell phone vibrates when a text message comes/arrives. 4. The cell phone vibrates when a text message is sent …

More Similar Questions