Physical Science Quiz 3

A floating leaf oscillates up and down two complete cycles in 1 s as a water wave passes by. The wave's wavelength is 10 m. What is the wave's speed? 2 m/s 10 m/s 20 m/s 40 m/s

10m wavelength x 2 cycles/sec frequency = 20 m/s Wavelength = velocity/frequency Speed = Wavelength x Wave Frequency

Two charges separated by one meter exert a 1-N force on each other. If the charges are pushed to 0.25-m separation, the force on each charge will be 1 N. 2 N. 4 N. 8 N. 16 N.

16 N If two charges are separated by a certain distance and the magnitude of each charge is doubled, the force on each charge is quadrupled. The distance between these two charges was quadrupled, so the force is multipled by 16.

Unlike a transverse wave, a longitudinal wave has no amplitude. no frequency. no wavelength. no speed. all of the listed attributes.

all of the listed attributes

Some of a wave's energy dissipates as heat. In time, this will reduce the wave's speed. wavelength. amplitude. frequency. period.

amplitude, which is the wave measurement from its equilibrium position

For light, a red shift indicates the light source moves toward you. away from you. at right angles to you. actually, all of the above.

away from you, blue shift is toward you

The electrical forces between charges depends on the magnitude of electric charges. separation distance between electric charges. both distance and magnitude the charge of the electrical forces

both distance and magnitude

If you double the frequency of a vibrating object, its period doubles. halves. is quartered. not information is provided.

halves

A balloon will stick to a wooden wall if the balloon is charged negatively. positively. either negatively or positively. neither negatively nor positively.

negatively

The electric field around an isolated electron has a certain strength 1 cm from the electron. The electric field strength 2 cm from the electron is half as much. the same. twice as much. four times as much. none of the above

none of the above, because it's one-fourth

A wave travels an average distance of 1 m in 1 s with a frequency of 1 Hz. Its amplitude is less than 1 m. 1 m more than 1 m not enough information given

not enough information given

A negatively charged rod is brought near a metal can that rests on a wood table. You touch the opposite side of the can momentarily with your finger. The can is then positively charged. negatively charged. uncharged. charged the same as it was.

positively charged

To be safe in the unlikely case of a lightning strike, it is best to be inside a building framed with steel. wood. both the same

steel, so that the charge can be dissipated around the outside and into the ground