英文字典,中文字典,查询,解释,review.php


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       


安装中文字典英文字典辞典工具!

安装中文字典英文字典辞典工具!










  • How is temperature related to color? - Physics Stack Exchange
    The sky appears blue, does that mean its hot? But it isn't right? It's colder I am not sure if I'm able to frame it properly It's a bit confusing to me Is this something like a glowing object vs reflecting object? The sun is white but Earth is blue But sun is hotter than the earth It's the sun radiating light but earth is just scattering it
  • Why is the sky not purple? - Physics Stack Exchange
    The net effect is that the red and green cones are stimulated about equally by the light from the sky, while the blue is stimulated more strongly This combination accounts for the pale sky blue colour It may not be a coincidence that our vision is adjusted to see the sky as a pure hue
  • Why can I never see any stars in the night sky?
    2 What color is your sky during the day? If it is deep blue, then you should see lots of stars at night even in a large city If your daytime sky is very light blue though, or worse, pale grey, white, brown, or orange, then you have a problem City light polution will light up this haze at night and make it impossible to see any stars
  • optics - What makes some laser beams visible and other laser beams . . .
    22 What makes the beam of some lasers: visible? such as the ones used in clubs or such as the laser pointers sold at amazon which if pointed to the sky look like a solid visible beam of light crossing the sky (it reminds me of the lightsaber in Star Wars) invisible? such as the ones used in pointers for presentations
  • optics - Why does the sky look black in pictures taken from the summit . . .
    In pictures taken from the summit of Mount Everest (such as this one), the colour of the sky is a very dark blue or even black in some pictures I remember from my own experiences of hiking in the Himalayas that the sky appeared to be darker blue as I climbed higher
  • Why does the sky suddenly look gray through this window?
    But why does it look so much less blue, when the values of the red and green channels are still smaller than the blue? That is entirely an effect of human perception
  • Why is the blue color of sky darker in high altitude regions?
    The sky is actually black Check that for yourself at midnight So in the daytime, you are looking at a black sky that is "illuminated" by mostly blue scattered sunlight The higher your altitude, the dimmer is the blue scattered illumination, so you start to see more of the basic black of the sky You can test this on your computer display, by going to the color palette and setting it to full
  • visible light - Why is the sky blue? - Physics Stack Exchange
    Possible Duplicate: Why does the sky change color? Basically what the title says What mechanisms are significant and how do they contribute to make the sky blue Also when the sky is not blue,


















中文字典-英文字典  2005-2009