Radio astronomers often study the radiation emitted by a hydrogen atom from a transition between the two hyperfine levels associated with the ground state
This radiation has a wavelength of 21 cm. What is the energy difference between the hyperfine levels? (1 eV = 1.60 × 10-19 J)
A) 5.9 × 10-6 eV
B) 5.9 × 10-25 J
C) 1.7 × 10-24 J
D) 4.7 × 10-25 J
A
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Which of the following statements is true of coronal holes?
A) Open magnetic fields allow ionized gas to flow away as the solar wind. B) Reconnection events prevent the release of ionized gases outward from the corona. C) Discharge of solar materials is prevented because the region is extremely thick. D) Magnetic field loops back into the Sun to trap the solar wind.
Vision Problems: A farsighted girl has a near point at 2.0 m but has forgotten her glasses at home. The girl borrows eyeglasses that have a power of +2.75 diopters. With these eyeglasses, what is the near point of the girl, assuming that she wears them extremely close to her eyes?
A. 28 cm B. 31 cm C. 33 cm D. 37 cm E. 40 cm
Of all the terrestrial planets, ________ has the largest daily temperature variation.
A. Earth B. Mars C. Mercury D. Venus
A metal wire has a resistance of 10.0 V at a temperature of 20.0°C. If the same wire has a resistance of 10.6 V at 90.0°C, what is the resistance of this wire when its temperature is 220.0°C?
1.0.700 V 2.9.66 V 3.10.3 V 4.13.8 V 5.6.59 V