A radio wave has a wavelength of 1.0 km. What is the radio frequency?
0.30 MHz
300 KHz
3.0 MHz
30 KHz
freq=3E8/1E3
What is E?
To determine the radio frequency, we can use the formula:
Frequency (in Hz) = speed of light / wavelength
The speed of light is approximately 3.0 x 10^8 meters per second. Since the wavelength is given in kilometers, we need to convert it to meters.
1 kilometer = 1000 meters
Therefore, the wavelength of 1.0 km is equal to 1000 meters.
Now we can calculate the frequency:
Frequency = (3.0 x 10^8 m/s) / (1000 m)
Frequency = 3.0 x 10^5 Hz
To convert this to MHz, we can divide the frequency by 10^6:
Frequency = (3.0 x 10^5 Hz) / (10^6)
Frequency = 0.30 MHz
Therefore, the radio frequency of a radio wave with a wavelength of 1.0 km is 0.30 MHz.
To find the radio frequency, you need to use the formula:
Frequency (in Hz) = Speed of light (in m/s) / Wavelength (in meters)
First, convert the wavelength to meters by multiplying it by 1000 since 1 km equals 1000 meters:
Wavelength = 1.0 km * 1000 = 1000 meters
The speed of light is approximately 299,792,458 meters per second. Now, substitute the values into the formula:
Frequency = 299,792,458 m/s / 1000 meters
Frequency ≈ 299,792 Hz
Now convert the frequency to kHz by dividing it by 1000:
Frequency = 299,792 Hz / 1000 ≈ 299.8 kHz
Therefore, the radio frequency for a radio wave with a wavelength of 1.0 km is approximately 299.8 kHz. None of the given options are a match to this frequency.