A stone is thrown upward with a speed 'u' from the top of a tower reaches the ground with velocity ' $3 u$ '. The height of the tower is ( $g=$ acceleration due to gravity)
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.
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