Question

suppose the moon emits light of its own.would it still have phases?justify your answer

Answer 1

no because 
if it emits light it will not have any shadows cast by the earth as the the incident ray is from the moon 

Answer 2

If the moon emits light of its own then it would have no phases.
the moon does not have it's own light.It  shines due to the reflected light of the sun.Therefore, phrases are formed.If the moon emits it's own light then no shadows will be formed as a result no phases will also be formed.