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  1. 1 是錯的。因為內能和物體的大小有關。而熱則會由高溫物體流向低溫物體。所以當您倒一杯100度的水入湖中﹐整個湖的內能固然高過100度的水﹐但熱會由100度的水流向湖水。 2 是對的。熱幅射強度 正比於溫度的4次方。 3 是對的。紅外線是電磁波的一種 4 是錯的。正常氣體何來自由電子...

  2. ...ice block of mass 0.05kg is mixed with xkg of water at 0C in a well insulated container. If 25000J of energy is ...

  3. Pressure (symbol: p) is the force per unit area applied on a surface in a direction perpendicular to that surface. Mathematically: p=F/A where: p is the pressure F is the normal force A is the area. Pressure is...

  4. ...virtually all matters easily. So just a piece of paper will never shield well . Shielding for gamma rays requires large amounts of...

  5. implantation have the following functions (i)it can make the fusion of gametes to carry out mitosis so that zygote is formed. (ii)The implantation provides a place called placenta for the zygote to grow into foetus. (iii)One implantation...

  6. (a). You need to draw a scale diagram. First draw the boy's image behind the mirror. Then draw a light ray from the feet of the image to the boy's eyes. Finally, complete the light ray from the feet of the boy to the point where the image light ray meets the mirror. (b...

  7. When a sandwich put into the sandwich toaster and the switch of the heater insider the toaster is turn on,electrical energy will change to heat energy and transver to the sandwich.當把三文治放入飛碟機,飛碟機內的發熱體的開關同時開啟,發熱體便會通電,然後電能會轉為熱能,熱能便會傳送給三文治...

  8. You can find different kinds of strong magnets at Sham Shui Po Apliu Street. Sorry that It is not closed to Tung Chung. The magnets are sold by...

  9. ... selling yak butter and meat, cheese, fruit and vegetables, as well as clohing, souvenirs, gear for horses and religious artefacts...

  10. ...you are investigating. Add more liquid fertilizer is the best for the plants. c) I) What is the variable to be...