20. Henri Becquerel expected to see only weak images on the photographic plate containing the uranium salt because he thought
O fluorescent minerals needed direct sunlight to produce radio waves.
O fluorescent minerals needed direct sunlight to produce X-rays.
O fluorescent minerals needed direct sunlight to produce microwaves.
O fluorescent minerals needed direct sunlight to produce gamma rays.

ok whats the question if not i cannot you i need question and need a thing to answer

dipole moments occur when there is a separation of charge. they can occur between two ions in an ionic bond or between atoms in a covalent bond; dipole moments arise from differences in electronegativity. the dipole moment is a measure of the polarity of the molecule.

explanation:

in inorganic chemistry -dipole moment ( μ ) is the measure of net molecular polarity, which is the magnitude of the charge q at either end of the molecular dipole times the distance r between the charges. μ = q × r.