Grade 12 · Science review
Waves, circuits, and momentum. Written in American English for students, parents, and teachers in the United States.
Open a card to see the answer. These are original practice items for US elementary students — not a state test copy.
Answer: how many cycles occur per second (hertz)
f = 1/T.
Answer: wave speed equals frequency times wavelength
In air, sound is much slower than light.
Answer: the same through each resistor
Voltage drops add to the battery voltage.
Answer: the same as the source (ideal wires)
Currents in the branches add.
Answer: V = IR
Voltage, current, resistance.
Answer: mass times velocity (p = mv)
It is conserved in a closed system with no external impulse.
Answer: perpendicular to the direction of travel
Light and string waves are transverse.
Answer: longitudinal mechanical wave
It needs a medium; light does not.
Pick the next article in this topic — that is how a magazine issue is meant to be used.
