What are the shortest wavelength X-rays produced by a 50,000-V X-ray tube?
What will be an ideal response?
2.49 × 10-11 m
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When a ball increases in speed by the same amount each second, its acceleration
A) also increases each second. B) decreases each second. C) is constant. D) varies.
What layer of the Sun are we seeing in this photograph, and in what wavelength band was it photographed?
A) corona, photographed in x-rays B) chromosphere, photographed in visible light C) photosphere, photographed in visible light D) convection zone, photographed in infrared light E) radiation zone, photographed in x-rays
A semiconductor has an energy gap of 2.5 eV. What is the longest wavelength light of those listed below that will promote valence electrons into the conduction band?
A) 450 nm B) 525 nm C) 600 nm D) 725 nm E) 350 nm
The average distance from Earth to the Sun is
a. 1 ly. b. 1 million km. c. 1 million miles. d. 1 billion km. e. 150 million km.