List of top Questions asked in JEE Advanced- 2007

A ray of light travelling in water is incident on its surface open to air. The angle of incidence is $\theta$, which is less than the critical angle. Then there will be

A magnetic field $B=B_0 \widehat{j}$ exists in the region a < x < 2 a and $B=-B_0 \widehat{j}$ in the region 2a < x < 3a, where $B_0$ is a positive constant. A positive point charge moving with a velocity$v-v_0 \widehat{i} $ where $v_0$ is a positive constant, enters the magnetic field at x = a. The trajectory of the charge in this region can be like

The largest wavelength in the ultraviolet region of the hydrogen spectrum is $122 \,nm$. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is