Reference answers 1~7 BBADC AD8. Heat transfer and diffusion are unchanged 9. Exhaust cannot be directional 10.8 is not unchanged 11. Inverted camera is unchanged 12. And 1.68×105 is greater than 13. Reflection virtual 514.C is equal to change 16. (1 ) 1 3.85 (2) Negative and sam

Reference answer

1~7 BBADC AD

8. Heat transfer and diffusion are unchanged

9. Exhaust cannot be directional 0

10.8 is not unchanged

11. Inverted camera is unchanged

12. And 1.68×105 is greater than

13. Reflection virtual 5

14.C is equal to change

16 . (1) 1 3.85

(2) Negative and same as

(3) Thermal expansion and cold contraction cannot 36.5

17. (1) Right

(2) Vertically downward 2

(3) 2:1 Right

18. (1) Connection The switch is not turned off during the circuit

(2) ① 0.6 0.22 ② 5 ③ Error The bulb can emit light normally at a higher voltage. The failure to emit light in the fifth measurement may be because the actual power is too small

21. (1) Its own gravity

( 2) 1.03×108

(3) 0.25 1.75 floats C

22. (1) is 3×108

(2) C

(3) Ⅱ cannot

23. (1) large

(2) becomes larger first, then remains unchanged 100

(3) 50.4

(4) 109