$E=200\left[\sin \left(6 \times 10^{15}\right) t+\sin \left(9 \times 10^{15}\right) t\right] \,Vm ^{-1}$
Given : $h=4.14 \times 10^{-15} \,eVs$
If this light falls on a metal surface having a work function of $2.50 \,eV$, the maximum kinetic energy of the photoelectrons will be ........... $eV$
$K_{\max }=h f-\phi$
$=\frac{9 \times 10^{15} \times 4.14 \times 10^{-15}}{2 \pi}-2.50$
$3.43 \,eV$
nearest is $3.42 \,eV$
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$(a)$ The size of the antenna should be comparable to signal wavelength which is unreal solution for a signal of longer wavelength.
$(b)$ Effective power radiated by a long wavelength baseband signal would be high.
$(c)$ We want to avoid mixing up signals transmitted by different transmitter simultaneously.
$(d)$ Low frequency signal can be sent to long distances by superimposing with a high frequency wave as well.
Therefore, the most suitable options will be
