An x-ray tube accelerates electrons through a potential difference of 50.0 kV. If an electron in the beam suddenly give up its energy in a collision,
what is the shortest wavelength x-ray it could produce? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, e = 1.60 × 10-19 C)
2.48 × 10-11 m
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A neutral atom has an electron configuration of 1s22s22p63s23p2. What is its atomic number?
A) 5 B) 11 C) 14 D) 20 E) 26
A guitar-like stringed instrument has a string that is 16 cm long. It sounds the musical note A (440 Hz) when played without fingering. By what distance should you shorten it to play the note C (523 Hz)?
A) 1.7 cm B) 3.4 cm C) 2.5 cm D) 4.2 cm
The objective lens and the eyepiece of a microscope have focal lengths of 4.0 mm and 25 mm, respectively. The objective produces a real image 30 times the size of the object, with the final image viewed at infinity
The near point of the microscope user is at 25 cm. What is the distance between the object and the focal point of the objective lens? A) 0.13 mm B) 0.18 mm C) 0.23 mm D) 0.28 mm E) 0.33 mm
What is the major component of Io's volcanic flows?
A) basaltic lava, like the lunar mare B) liquid nitrogen, like the eruptions of Triton C) sulfur and its compounds D) carbon dioxide and water vapor, as with our eruptions E) iron oxide, as on Mars