Which question will help tell if a wave is an electromagnetic wave or a mechanical wave?
OA
Does the wave have a frequency?
OB
Does the wave have a wavelength?
O
C
Can the wave travel between the Sun and Earth?
O
O
D
Can the wave travel between a gas and a liquid?

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.