A metal surface is illuminated by light of two different wavelengths 207 nm and 414 nm . The maximum speeds of photoelectrons corresponding to these wavelengths are $\mathrm{u}_1$ and $\dot{u}_2$ respectively with $u_1: u_2=2: 1$. The work function of the metal is $(\mathrm{hc}=1242 \mathrm{eV} \mathrm{nm})$
In thermodynamic process, which of the following statements is not true?
A charged particle is subjected to acceleration in a cyclotron which consists of two dees ' $\mathrm{D}_1$ ' and ' $D_2$ '. The charged particle undergoes increase in its speed.
In case of well of death which is a vertical cylindrical wall of radius ' $r$ ' inside which vehicle is driven in horizontal circles. If ' $m$ ' is mass of vehicle, ' $V$ ' is the velocity and ' $\mu_s$ ' is the coefficient of static friction between the wheels of vehicle and walls then correct relation is [ $\mathrm{g}=$ acceleration due to gravity]