Flag questionQuestion textSilicon, which makes up about 25% of Earth's crust by mass, is used widely in the modernelectronics industry. It has three naturally occurring isotopes,28Si,29Si, and30Si. Calculate theatomic mass of silicon.IsotopeIsotopic Mass (amu)Abundance %28Si27.97692792.2329Si28.9764954.6730Si29.9737703.10Select one:a. 29.2252 amub. 28.9757 amuc. 28.7260 amud. 28.0855 amue. 27.9801 amuFeedbackThe correct answer is: 28.0855 amuQuestion5Correct4.60 points out of 4.60Flag questionQuestion text
Which of the following is a type of radioactive radiation which has no charge and are unaffectedby external electric or magnetic fields?Select one:a. α raysb. β raysc. γ raysd. δ rayse. ε raysFeedbackThe correct answer is: γ raysQuestion6Incorrect0.00 points out of 4.60Flag questionQuestion textSelect the arrangement of electromagnetic radiation which starts with the lowest energy andincreases to greatest energy.Select one:a. radio, infrared, ultraviolet, gamma raysb. radio, ultraviolet, infrared, gamma raysc. gamma rays, infrared, radio, ultravioletd. gamma rays, ultraviolet, infrared, radioe. infrared, ultraviolet, radio, gamma rays
FeedbackThe correct answer is: radio, infrared, ultraviolet, gamma raysQuestion7Correct4.60 points out of 4.60Flag questionQuestion textWhich of the following is a chemical change?Select one:a. Boiling of waterb. Melting waxc. Broiling a steak on a grilld. Condensing water vapor into rainfalle. Carving a piece of woodFeedbackThe correct answer is: Broiling a steak on a grillQuestion8Correct4.60 points out of 4.60Flag questionQuestion textWhich of the following is an extensive property?
Select one:a. Densityb. Temperaturec. Massd. Specific Heate. PressureFeedbackThe correct answer is: MassQuestion9Incorrect0.00 points out of 4.60Flag questionQuestion textUse the Rydberg equation to calculate thefrequencyof a photon absorbed when the hydrogenatom undergoes a transition fromn1= 2 ton2= 4. (R= 1.096776 × 107m–1;c= 3.0 × 108m/s).Select one:a. 2.056 × 106s–1b. 2.742 × 106s–1c. 6.165 × 1014s–1d. 8.226 × 1014s–1e. > 1015s–1Feedback
The correct answer is: 6.165 × 1014s–1Question10Correct4.60 points out of 4.60Flag questionQuestion textThe mass of a sample is 550 milligrams. Which of the following expresses that mass inkilograms?Select one:a. 5.5 × 108kgb. 5.5 × 105kgc. 5.5 × 10-4kgd. 5.5 × 10-6kge. 5.5 × 10-1kgFeedbackThe correct answer is: 5.5 × 10-4kgQuestion11Correct4.60 points out of 4.60Flag questionQuestion textThe size of an atomic orbital is associated with
Select one:a. the principal quantum number (n).b. the angular momentum quantum number (l).c. the magnetic quantum number (ml).d. the spin quantum number (ms).e. the angular momentum and magnetic quantum numbers, together.FeedbackThe correct answer is: the principal quantum number (n).Question12Correct4.60 points out of 4.60Flag questionQuestion textHow many hertz is 600.11 MHz?Select one:a. 6.0011 × 10-4Hzb. 60.011 Hzc. 6.0011 × 106Hzd. 6.0011 × 10-2Hze. 6.0011 × 108HzFeedbackThe correct answer is: 6.0011 × 108Hz
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