The energy levels of electrons in atoms are ______________, which means that only certain values of energy are allowed
Fill in the blank(s) with correct word
quantized
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The Sun is at one focus of the elliptical orbit of the Earth aroundthe Sun. What is atthe other focus?
a) Nothing. b) The Earth. c) Mars. d) The Moon. e) Jupiter.
NH3 is an example of
A) a molecule only B) a compound only C) both a molecule and a compound D) a collection of isolated atoms
At a depth of about 1030 m in the sea the pressure has increased by 100 atmospheres (to about 107 N/m2). By how much has 1.0 m3 of water been compressed by this pressure? The bulk modulus of water is 2.3 × 109 N/m2
A) 2.3 × 10-3 m3 B) 3.3 × 10-3 m3 C) 4.3 × 10-3 m3 D) 5.3 × 10-3 m3 E) 6.3 × 10-3 m3
On the basis of the scientific method, which of the following would be considered conclusive evidence that we are being visited by aliens?
A) an eyewitness account B) none of these would be conclusive C) claims of alien abduction made under hypnosis D) a photograph