How devices use waves to send and capture information and energy
Grade 11 Science Worksheet
Circle the best answer, or write your answer on the line.
An ultrasound pulse returns from a boundary in a gel test block after 130 μs. The scanner assumes 1540 m/s. How deep is the boundary, to 0.01 cm, Ari?
An ultrasound pulse returns from a boundary in a gel test block after 78 μs. The scanner assumes 1540 m/s. How deep is the boundary, to 0.01 cm, Bo?
An ultrasound pulse returns from a boundary in a gel test block after 200 μs. The scanner assumes 1540 m/s. How deep is the boundary, to 0.01 cm, Esme?
Read this first
Use this
The scanner assumes sound travels 1540 m/s.
In the signal strip, about how deep is the boundary whose echo returns after 52 μs, Jun?
- About 4 cm
- About 52 cm
- About 8 cm
In the signal strip, why does one echo arrive later than the other, Kira?
Use the picture in question 4.
- It was a much louder echo
- It traveled faster
- It came from deeper down
Panels are rated at 1000 W/m² of sunlight (NREL test conditions). A 1.6 m² panel is 20% efficient. What power does it give, Milo?
- 320 W
- 1600 W
- 200 W
A second panel has twice the area and the same efficiency. How does its power compare, Noah?
- Twice as much
- Four times as much
- Half as much
A panel is 20% efficient. What does that mean, Pia?
- It works 20% of the day
- It lasts 20 years
- It turns 20% of the light into electricity
Why do phones use radio waves rather than visible light to reach a tower, Ren?
- Radio passes through walls
- Radio is faster than light
- Light can't carry bits
Why do different radio stations and phones use different frequencies, Tala?
- So their signals don't mix
- So they use less battery
- So some travel faster