Final answer:
The range of a commercial airliner burning either gaseous or liquid hydrogen is estimated to be around 300 miles, while the range with JP4 fuel is 6000 miles.
Step-by-step explanation:
The range of an aircraft depends on the fuel it uses. Given that a commercial airliner has a range of 6000 miles using 200 tonnes of JP4 fuel, we can estimate the range of the aircraft burning either gaseous or liquid hydrogen.
a) Gaseous hydrogen: Using the information provided, the reduction in energy per mass for gaseous hydrogen compared to jet fuel is 20 times, which means the range would be 6000 divided by 20, resulting in a range of 300 miles.
b) Liquid hydrogen: Liquid hydrogen has a similar energy density as gaseous hydrogen, so the range would also be around 300 miles.
c) Range with JP4 fuel: The range with JP4 fuel is already given as 6000 miles.
d) No change in range: None of the options mentioned will result in no change in range.