Reference no: EM133229370

Question 1.

What is it that determines the color of an object? How would a coat of many colors appear in a room lit by light of a single wavelength?

Question 2.

What happens when light falls on an opaque, absorbent object?

Question 3.

What is a "black body?" Does a "black body" really appear black? At what temperatures? Why do astronomers ?nd it useful to study "black bodies?"

Question 4.

In what part of the spectrum does most of the radiation of an ordinary household bulb lie? is it a very e?icient light source? (The temperature of the ?lament is about 3000 K.)

Question 5.

Two stars of equal size have temperatures of 4000 K and 12,000 K. W'hich radiates more energy per second? How much more? What color will each appear? W'hich radiates more energy in the red part of the spectrum?

Question 6.

Why does a black body never appear greenj though it may appear red or blue at various temperatures?

Question 7.

If a star has a surface temperature of 12,000 K and a luminosity equal to that of the sun, what can you conclude about its size?

Question 8.

Two stars are observed to have the same parallax and the same bright- ness. One is red and the other is blue. Which star is larger?

Question 9.

How is it possible to have a beam of red light that is brighter than a beam of blue light: when blue-light photons are more energetic than those of red light?