How devices use waves to send and capture information and energy
Grade 11 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
Quartz glass has n = 1.46 (Engineering ToolBox). For light inside it meeting air (n = 1.00), what is the critical angle, to 0.01°, Ari?
Water has n = 1.333 (Engineering ToolBox). For light inside it meeting air (n = 1.00), what is the critical angle, to 0.01°, Bo?
Diamond has n = 2.417 (Engineering ToolBox). For light inside it meeting air (n = 1.00), what is the critical angle, to 0.01°, Esme?
Why does light stay inside a fiber-optic cable as it bends, Jun?
- The light slows to a stop
- Total internal reflection at the edge
- The glass soaks up the light and glows
How must the cladding around a fiber's core compare with the core, Kira?
- It has a higher refractive index
- It must be made of metal
- It has a lower refractive index
A fiber is bent so sharply that light meets the edge at less than the critical angle. What happens, Luz?
- More light is trapped
- The light speeds up
- Some light escapes
Why do ultrasound scanners use millions of vibrations per second, Milo?
- Short waves show fine detail
- Low pitches can't enter gel
- High pitches are louder
Why do internet links between cities use fiber rather than copper wire, Noah?
- Copper can't carry any electric signals
- Light carries far more bits each second
- Fiber is heavier and stronger
A router offers 2.4 GHz and 5 GHz. Which usually reaches farther through walls, Pia?
- 2.4 GHz, with its longer waves
- 5 GHz, since it is faster
- Both reach equally far
Ren says ultrasound scanners use X-rays. Agree or disagree?
- Disagree: they use sound waves
- Agree: they use very weak X-rays
- Agree: echoes are X-rays