To what is the radiation damage in biological organisms primarily due?
a. helium introduction
b. heating
c. induced radioactivity
d. ionization
d
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Six months of darkness at the North Pole begins when the Sun is at the
a. winter solstice. b. summer solstice. c. autumnal equinox. d. vernal equinox.
The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ? ? m. The toaster is designed to operate at a voltage of 120 V
How much power does it draw in normal operation? A) 370 W B) 360 W C) 380 W D) 400 W E) 410 W
Addition of an electron to an atom gives a
a. negative ion. b. neutron. c. new element. d. positive ion.
The atomic mass number of a nucleus is equivalent to which of the following numbers?
a. sum of neutron and proton numbers b. number of neutrons present c. number of protons present d. difference in neutron and proton numbers