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Unit review: waves, light, and signals — Homework
Mixed review: use the correct wave, signal, or circuit idea from this unit for each problem.
- 1.A wave has a frequency of 8 Hz and a wavelength of 5 m. Find its speed.
- 2.A circuit has a 15 V battery and a 5 ohm resistor. Find the current.
- 3.Why can astronauts talk to each other by radio in space, even though sound cannot travel through a vacuum?
- 4.Classify a thermostat dial you turn smoothly versus one with fixed number buttons. Which is analog and which is digital?
- 5.Why does an electromagnet lose its magnetism when its circuit is switched off, while a bar magnet does not?
- 6.Pick one topic from this unit and explain it using an example from your own life.
🌲 Homeschool of the FutureEighth Grade · Science · week 27 homework