If a drone flies 8 m/s due East with respects to the wind and the wind is blowing 6 m/s due North, the speed of the drone with respect to the ground is its displacement.
Displacement is calculated using Pythagoras theorem.
d² = 8²+6²
d² = 64+36
d² = 100
Square root both sides
√d² = √100
d = 10m/s
Hence the distance of the drone with respect to the ground is 10m/s
Energy of a wave: E = nhc/λ 3000 = (n x 6.63 x 10⁻³⁴ x 3 x 10⁸)/(510 x 10⁻⁹) n = 7.69 x 10 ²¹ photons per second per meter² 2.70 cm² = 2.70/10,000 m² = 2.7 x 10⁻⁴ Photons per second = 7.69 x 10 ²¹ x 2.7 x 10⁻⁴ = 2.08 x 10¹⁸ photons per second
