1. Which type of electromagnetic wave has the smallest wavelength?
- Visible light
- Gamma rays
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2. What does a decrease in wavelength of an object suggest?
- That the object is stationary
- That it is moving closer to the observer
- It is moving away from the observer
3. What is transferred through the National Grid?
4. Why is a high voltage used?
- It decreases the amount of energy wasted in cables
- It increases the amount of energy wasted in cables
- The cables cannot transfer low voltage electricity
- So they can transfer the electricity at a high current