Question: what are the units of h in the equation e = hf
[{'answer': "Planck 's constant", 'provenance': [{'wikipedia_id': '19594213', 'title': 'Planck constant', 'start_paragraph_id': 58, 'start_character': 360, 'end_paragraph_id': 58, 'end_character': 383, 'bleu_score': 1.0, 'section': 'Section::::Significance of the value.\n'}]}, {'provenance': [{'wikipedia_id': '19594213', 'title': 'Planck constant', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 130, 'bleu_score': 0.614232239519937, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17846863620365046292}, 'section': 'Section::::Abstract.'}]}]