Choose one best answer for each on the Which of the following underlined items i
ID: 1000915 • Letter: C
Question
Choose one best answer for each on the Which of the following underlined items is not an intensive property? A) chemical requires B) Solid copper hydroxide is blue colored. C The density of helium at 25°C is 1.64 x 10-4 g/cm3. D) The melting point of aluminum metal is 933 K. 2) The diameter of the nucleus of an atom is approximately 1 x 10-15 meters. If I nm is equal to 10 Angstroms, what is the diameter of the nucleus in Angstroms? A) 1 x 10-23 A C) 1 x 10-7 A D) 1 x 10-5 A 3) A gold ingot weighs 5.50 lbs. If the density of gold is 19.31 gcm3, and the length and width of the ingot are 12.0 cm and 3.00 cm respectively, what is the height of the ingot? A) 6.50 x 10-3 cm B) 3.59 cm C) 0.2 cm. D) 1.34 x 103 cm 4) A student measured the diameter of a sphere and determined the average value. His cm, what measurements are 5.17 cm, 5.16 cm, 5.16 cm, and 5.17 cm. lf the true diameter is 6.18 can be said about the student's results? A) It is accurate and precise It is accurate not precise. C) It is precise but not accurate. D) It is neither precise nor accurate. 5) What is the de Broglie wavelength of an electron (m-9.11 x 10-31 kg) moving at a velocity of 3.0 x 107 m/s? de Broglie equation hlmv, where Planck's constant, h 6.626 x 10 Kg m /s. A) less than 3.9 x 10-12 m B) 2.4 x 10-11 m 3.3 x 10-8 m D) greater than 1.1 x 10-4 mExplanation / Answer
1) The correct answer is Option A
2) 1A = 10^(-10)m
Hence the diameter of nucleus = 1 * 10^(-5) A
Therefore the correct answer is Option D
3) Use Density = Mass/Volume
Then use Volume = pi * r^2 * h
4) Since the readings don't differ too much, hence the readings are precise but since the readings are too far from the actual value
Hence the correct answer is Option C
5)
lambda = h/mv
=> [6.64 * 10^(-34)]/(9.11 * 10^(-31) * 3 * 10^7)
=> 2.429 * 10^(-11)
Hence the correct answer is Option B