108-2 The Way Science Works : Final Exam

10 points each question

(microwave)

Lowest possible temperture in this Universe is roughly -273.15 K.

Reasonance happens when the value of natureal and external: A. frequency, B. intensity, C. resisitivity, D. capacity, become the same.

Multi-holes metal door prevent microwave lead but allow visial light to pass through, we it is safe to to look at a microwave oven through the front panel while it is cooking.

Heat resisting metal explains why metal-ware should not be pt inside microwave oven whereas the oven is amde of metal.

(frig)

Latent heat is the amount heat required to turn liquid into vapor.

Frequency varying air-cinditioning machine is energy efficient because it reduce the number of power-up times, the short moemnt causing most electic power. (X)

 

(color)

Green and Red light combined as yellow, as do the green and red pigment. (X)

Adding green and red pigments together, the resulting color becomes A. yellow, B. blue, C. black, D. cyan. E. mageta.

Spectral color are those appear in rainbow, so infrared and untraviolet should be regard as non-spectral colors. (X)

 

(camera)

When the apature (iris) is set small, the range of see objects learly in focus is wider. (O)

To take a picture with main object clear and background blur, photographer should chose a bigger size apature (iris).

Modern Camera leses have many pieces of lenses combied together, is reason is to make the image larger, this is particualry true for small diameter cases such as mobile phone lens.

(CD)

CCD cameratechnology was the reason why we can see the lanscape of the Mars send back earth by land exploler.

Laser is needed for reading CD and DVD because of the single colorness of the light beam. (X)

Although write-once Recordable DVD is less flexible than re-writable DVD, it actually keeps written digital its longer, so should be chosen for long-term storage purpose. (X)