Based on the H-R diagram shown above, about how long does a main-sequence star of spectral type G spend fusing hydrogen into helium in its core?
A) 1000 years
B) 10,000 years
C) 1 million years
D) 100 million years
E) 10 billion years
E) 10 billion years
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Diffraction Gratings: 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. 138 nm B. 183 nm C. 367 nm D. 637 nm
It's cold. You are sitting on what appears to be a water ice-covered world. The Sun is low on the horizon and circles the horizon once every 24 hours
Despite the low Sun, you can almost "feel" the Sun's ultraviolet radiation on your exposed face because there is little ozone to protect you. Despite these discomforts, you are pleased to find that the air is quite satisfactory; oxygen seems plentiful and you are able to breathe even without the life-support belt.
The places where the Sun crosses the equator are called the:
A) annalemmas. B) prime meridians. C) zeniths. D) equinoxes. E) solstices.
The root-mean-square speed (thermal speed) of the molecules of a gas is 200 m/s at 23.0°C. At 227°C the root-mean-square speed (thermal speed) of the molecules will be closest to
A) 260 m/s B) 630 m/s C) 330 m/s D) 160 m/s E) 2000 m/s