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The big question: How strong is our sun? Why are we learning this? The sun is dying, slowly…

The big question: How strong is our sun? Why are we learning this? The sun is dying, slowly…. Homework: P139 q1. Learning Objective: To combine knowledge on speed, power output and intensity The big question: How strong is our sun? A – Evaluate efficiency, power and intensity

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The big question: How strong is our sun? Why are we learning this? The sun is dying, slowly…

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  1. The big question: How strong is our sun? Why are we learning this? The sun is dying,slowly…

  2. Homework: P139 q1

  3. Learning Objective: To combine knowledge on speed, power output and intensity The big question: How strong is our sun? A – Evaluate efficiency, power and intensity B – Predict sound intensity and predict reasons for inaccuracy C – Calculate the sun’s power for different planets D – Identify intensity/amplitude relationship

  4. Plot 2 waves on displacement-time graphs,one with amplitude TWICE the size of the other, but both in phase Speed = gradient of a wave. At displacement 0, draw on the gradients (C) Plot a wavewith halfthe gradient ofthe smaller one

  5. Plot 2 waves on displacement-time graphs,one with amplitude TWICE the size of the other, but both in phase Speed = gradient of a wave. At displacement 0, draw on the gradients If 1 gradientis twice the other,one speed is twice KE= ½ mv2

  6. Learning Objective: To combine knowledge on speed, power output and intensity The big question: How strong is our sun? A – Evaluate efficiency, power and intensity B – Predict sound intensity and predict reasons for inaccuracy C – Calculate the sun’s power for different planets D – Identify intensity/amplitude relationship

  7. For your task you need to provide: - AN EXPLANATION - A SHEET OF WRITING YOU CAN GIVE TO THE OTHER GROUP - 3 QUICK NUMERICAL QUESTIONS FOR THEM, WITH ANSWERS - KEY PHRASES (WORDS+MEANINGS)

  8. On whiteboards again… The sun’s power output is 3.7 x 1023 kW Its distance to earth is 1.5x1011 m Neptune is 30 times further from the sun than earth. Calculate what the power output to Neptune is

  9. Learning Objective: To combine knowledge on speed, power output and intensity The big question: How strong is our sun? A – Evaluate efficiency, power and intensity B – Predict sound intensity and predict reasons for inaccuracy C – Calculate the sun’s power for different planets D – Identify intensity/amplitude relationship

  10. Pick a question, and complete in pairs.. (B) P144 q4 (A) P144 q5

  11. Are they correct? Why? He said she said… Mr Singh (B) says “Minimum energy to blow a car window is 0.5W. A 10W circular subwoofer 1m away from the back-window would be safe” Mrs Brown (A) says “If minimum energy necessary to keep earth alive is 1012W,and the sun loses 50% of its 3.7 x 1023kW power, we could be 100m away and still die”

  12. Learning Objective: To apply use of wave analysis The big question: How can we analyse a wave? A – Predict values using wave terms B – Evaluate consistency across wave terms C – Calculate wave terms for a variety of waves D – Understand the 6 key wave terms

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