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Which has the longest wavelength...

Which has the longest wavelength

A

infrared light

B

ultraviolet light

C

radio-waves

D

X-rays

Text Solution

Verified by Experts

The correct Answer is:
C
Comparing the given equation
`E_(y)=2.5(N)/(C)cos[(2pixx10^(6)(rad)/(sec))t-(pixx10^(-2)(rad)/(sec))x]`
With the standard equation
`E_(y)=E_(0)cos(omegat-kx)`
we get
`omega=2pif=2pixx10^(6)`
`:. f=10^(6)Hz`
Moreover, we know that
`(2pi)/(lamda)=k=pixx10^(-2)m^(-1)implieslamda=200m`
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