Hydrogen Balmer lines are strongest near ____ spectral class whereas ionized Calcium (CaII) lines are strong in ___ stars
a. A0, K b. O5, M5
c. M5, G1 d. M0, B0
a
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Our earliest atmosphere, formed by outgassing, was much poorer in ________ than now
A) carbon dioxide B) hydrogen C) oxygen D) methane E) nitrogen
A cup of coffee is enclosed on all sides in an insulated container 1/2 cm thick in the shape of a cube 10 cm on a side. The temperature of the coffee is 95°C, and the temperature of the surroundings is 21°C. Find the rate of heat loss (in J/s) due to conduction if the thermal conductivity of the cup is 2 × 10^-4 cal/s×cm×°C
a. 62 b. 74 c. 230 d. 160 e. 12
When a diffraction grating having 5000 lines/cmis illuminated by monochromatic light, the angle between the central maximum and the fourth order maximum is 47.2°. What is the wavelength of the light?
A) 367 nm B) 183 nm C) 138 nm D) 637 nm
The density of silver at room temperature is 10.49 g/cm3 . You need to know the density of solid silver just below the melting temperature. At 960°C the lattice parameter was measured to be 0.4176 nm. Compare the theoretical density of silver at 960°C to that at room temperature.
What will be an ideal response?