Determine the black body radiation emitted in the bandwidth ?1 = 0.2 ?m to ?2 = 5.0 ?m from a surface at a temperature of, (a) 100ºC, (b) 1000ºC, and (c) 3000ºC.
What will be an ideal response?
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The sound of a bird singing is given as 5 dB. What is the intensity of the sound of a bird singing?
a. 
b. 
c. 
d. 
e. 
A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 1.85 mW. How many photons are emitted each second? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 nm = 10?9 m)
a. 5.9E+15 b. 3.7E+34 c. 5.9E+24 d. 5.9E+18 e. 1.2E+17
If the Sun were twice as massive
A) its pull on the Earth would double. B) Earth's pull on the Sun would double. C) both of these D) none of the above
Open clusters tend to be ____ than globular clusters
a. younger and contain fewer stars b. younger and contain more stars c. older and contain fewer stars d. older and contain more stars e. more luminous and cooler