Answer:
(speed of light)
Explanation:
Electromagnetic waves are oscillations of the electric and the magnetic field that occur in a plane perpendicular to the direction of travelling of the wave.
All electromagnetic waves travel in a vacuum at the same speed, whose value is:
And this value is called speed of light.
Electromagnetic waves are classified into 7 different types, depending on their wavelength/frequency. From highest to lowest frequency, we have:
Gamma rays
X-rays
Ultraviolet radiation
Visible light
Infrared radiation
Microwaves
Radio waves
consider east-west direction along X-axis and north-south direction along Y-axis
= velocity of migrating robin relative to air = 12 j m/s
(where "j" is unit vector in Y-direction)
= velocity of air relative to ground = 6.3 i m/s
(where "i" is unit vector in X-direction)
= velocity of migrating robin relative to ground = ?
using the equation
=
+
= 12 j + 6.3 i
= 6.3 i + 12 j
magnitude : sqrt((6.3)² + (12)²) = 13.6 m/s
direction : tan⁻¹(12/6.3) = 62.3 deg north of east