please be clear about each answer thank you The distance to

please be clear about each answer thank you.

The distance to a star is approximately 9.60 * 10^18 m. If this star were to burn out today, how long from now would we see it disappear How long does it take for sunlight to reach Jupiter How long does it take for a microwave radar signal to travel from the Earth to the Moon and back How long does it take for a radio wave to travel once around the Earth in a great circle, close to the planet\'s surface How long does it take for light to reach you from a lightning stroke 9.8 km away

Solution

a) t = D / v = 9.60 * 10¹⁸ / 3 * 10⁸ = 3.20 * 10¹⁰ s

b) t_jupiter = s/c = (778.5 * 10⁹) / (3 * 10⁸)

= 2595 s = 43.25 min

c) The average distance between Earth and moon is about 384400 km thus the radar signal has to travel a total distance of about 768800 kilometers

t_moon = s / c = (768800 kilometers) / (3 * 10⁸)

= 2.56 s

e) t_lightning = s / c = (9.8 * 10³) / (3 * 10⁸)

= 0.00003267 s

= 32.67 mus