Aradio station's channel, such as 100.7fm or 92.3 fm, is actually it's frequency in megahertz, where 1 mhz = 10^6 hz and 1 hz = 1s-1. calculate the broadcast wave length of the radio station 96.90 fm.

You have to use the equation c=λν
c= the speed of light (3.00x10^8 m/s)
λ= the wavelength in m (in this case the unknown)
ν= the frequency in Hz or s^-1 (in this case 96.9x10^6 Hz)
The frequency of the 96.90 FM radio station is 96.90 MHz which equals 96.9x10^6 Hz and we know the speed of light since it is a constant. with this information we can rewrite the equation as λ=c/ν to get wavelength.
λ=(3.00x10^8 m/s)/(96.9x10^6 Hz)
λ=3.10 m

Zinc contains about 30 protons 

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.