Solar radiation is composed of electromagnetic (EM) waves. EM waves are transverse waves where the electric and magnetic fields oscillate perpendicular to the direction of wave propagation. Since solar radiation is an EM wave, and EM waves are transverse in nature, the correct answer is: Transverse EM wave
If the curves $$ 2x^2 + ky^2 = 30 \quad \text{and} \quad 3y^2 = 28x $$ cut each other orthogonally, then \( k = \)