An atomic nucleus has a charge of +40e. An electron is 10-9 m from the nucleus. What is the force on the electron?
A)
2.9 nN
B)
1000 C
C)
3.7 nN
D)
6.8 nN
E)
9.2 nN
E
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A beam of 1012 neutrons/second is incident on an aluminum foil of thickness 10-4 m. The cross section for absorption is 0.23 bn. What is the reaction rate for neutrons being absorbed?
A) 1.4 × 1011/s B) 1.4 × 109/s C) 1.4 × 108/s D) 1.4 × 1010/s E) 1.4 × 1012/s
The Michelson interferometer can make precise length measurements using which of the following phenomena?
a. resolving power c. force b. magnification d. interference
Most of the visible light from the Sun originates in the photosphere
a. True b. False Indicate whether the statement is true or false
An object is placed 12 cm in front of a curved mirror. The magnification of the image is -3.0. What is the focal length of the mirror?
A) 12 cm B) 9.0 cm C) 24 cm D) 36 cm E) 16 cm