1)Which statement best describes energy in an open system?

AAll energy and matter are contained within the system.

BEnergy and matter flow into and out of the system.

CMatter flows into and out of the system; energy does not.

DThere is no energy in an open system; there is matter.

2)When a sound source is moving toward the observer, the observer will hear a

Ahigher pitch due to the change to a lower frequency.

Bhigher pitch due to the change to a higher frequency.

Clower pitch due to the change to a higher frequency.

Dlower pitch due to the change to a lower frequency.