NASA detected a burst of gamma rays from a neutron star in space. The gamma radiation had a frequency of 1.0 × 1019 Hertz and the burst released a total of 1.0 × 1044 J of energy. How many moles of photons of gamma radiation were released during this burst?

1.51×10^58 moles of photons

Explanation:

n = E/hf

E is total energy = 1×10^44 J

h is Planck's constant = 6.634×10^-34 Js/mol

f is frequency of radiation = 1×10^19 Hz (1×10^19 s^-1)

n = 1×10^44/(6.634×10^-34 × 1×10^19) = 1×10^44/6.634×10^-15 = 1.51×10^58 moles of photons

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

so easy. just google the electromagnetic waves and it’ll pop up.