Which of the following statements about the Bohr model of the hydrogen atom is false?

Two points separated by a distance of 0.1 mm can just be seen in microscope when light of wavelength $6000 \mathop A\limits^o $ is used. If the light of wavelength $4800 \mathop A\limits^o $ is used, the limit of resolution will become

In the following circuit, the current $\mathrm{I_2}$ is

The first operation involved in a carnot cycle is