The distance of an illuminated object from its light source is doubled while the luminous flux remains constant. Which is true of the illuminance on the object?

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Explain what will happen if decomposers were apsent from a forest ecoysystem.

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up