Multiple choice The temperature of solar surface called 'photosphere' is about _____. 3000 K 4000 K 5000 K 6000 K Reveal answer Fill a bubble to check yourself D Correct answer Explanation The photosphere (visible surface of the Sun) has a temperature of approximately 6000 K (about 5700°C). This is why the Sun appears white/yellow to us - it emits light characteristic of a 6000 K black body radiator.