The energy of the photon having frequency 3×10¹⁵ Hz would be 
1. 1.988 × ${10}^{-18}$ J
2. 1.588 × ${10}^{-18}$ J
3. 1.288 × ${10}^{-18}$ J
4. 2.988 × ${10}^{-18}$ J

The correct arrangement of the following electromagnetic spectrum in the increasing order of frequency is
1. Cosmic rays < Amber light < Radiation of FM radio < X-rays < Radiation from microwave ovens
2. Radiation from FM radio  < Radiation from microwave oven < Amber light < X- rays < Cosmic rays
3. Radiation from microwave ovens < Amber light < Radiation of FM radio < X-rays < Cosmic rays
4. Cosmic rays < X-rays < Radiation from microwave ovens < Amber light < Radiation of FM radio

The neon gas emits radiation of 616 nm. The number of quanta that are present in 2 J of energy is

$$\begin{gathered} 1. 6.2 \times {10}^{-18} \\ 2. 5.6 \times {10}^{17} \\ 3. 6.2 \times {10}^{18} \\ 4. 32.2 \times {10}^{-20} \end{gathered}$$