Description : A radioactive isotope has a half-life of 10 days. If today there are 125 g of it left, what was its original weight 40 days earlier (a) 600 g (b) 1000 g (c) 1250 g (d) 2000 g
Last Answer : Half life = 10days The formula which is, 1/(2)^n × original weight = Weight left today. To obtain the value of n = divide no of days by half life ie.,n= 40/10= 4 n=4 So, 1/(2)^n × original Weight = 125g 1/(2)^4 × Original weight = 125 Original weight = 16×125 = 2000g
Description : The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent. (A) 3.125 (B) 6.25 (C) 12.50 (D) 25
Last Answer : (B) 6.25
Description : What is the half life of 3 g sample of radioisotope that decay to 0.75 g in 30 days?
Last Answer : 15 days
Description : If the half-life of a radioisotope is 2 days, after how many days is the quantity reduced to 12.5% of its original amount? w) 4 days x) 6 days y) 8 days z) 10 days
Last Answer : ANSWER: X -- 6 DAYS
Description : If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same isotope will be __________ days. (A) 5 (B) 10 (C) 20 (D) 30
Last Answer : (B) 10
Description : What is the half life of 12 g sample of radioisotope that decayed to 6 g in 28 years?
Last Answer : 28 years
Description : Why is there no formula to compute the half-life of any given radioisotope?
Last Answer : I don’t think the theories contain enough information about what is actually going on with subatomic particles that leads to those results.
Description : The radioisotope , tritium `(""_(1)^(3)H)` has a half-life of 12.3 years. If the initial amount of tritium is 32 mg , how many milligrams of it would
Last Answer : The radioisotope , tritium `(""_(1)^(3)H)` has a half-life of 12.3 years. If the initial amount of tritium is 32 ... A. 1 mg B. 2 mg C. 4 mg D. 8 mg
Description : Fifty micrograms of an isotope have decayed to 12.5 micrograms after 12 hours. What is the half life of the radioisotope?
Last Answer : ANSWER: SIX HOURS
Description : Initial amount of the radioactive element with half life 10 days is 16 g. What amount in gm of this element will remain after 40 days?
Last Answer : Initial amount of the radioactive element with half life 10 days is 16 g. What amount in gm of this element will remain after 40 days?
Description : What is 200g of 600g has a fraction?
Last Answer : It is 200/600, which can be simplified, if you so wish.
Description : A cylinder contains oxygen at a pressure of 10 atm and a temperature of 300 K. The volume of the cylinder is 10 liters. What is the mass of the oxygen in grams? Molecular weight (MW) of oxygen is 32 g/mole? a. 125.02 b. 130.08 c. 135.05 d. 120.04
Last Answer : 130.08 {(10atm)(10)(32)/(0.0821) (300K)}
Description : When a radioisotope undergoes beta minus decay, does its atomic number: w) increase x) decrease y) remain the same z) vary depending on the element involved
Last Answer : ANSWER: W -- INCREASE
Description : The half-life of an isotope of an element is 5 days. The mass of a 10 gram sample of this isotope remaining after 20 days is: w) 0.312 grams x) 0.625 grams y) 1.25 grams z) 2.50 grams
Last Answer : ANSWER: X -- 0.625 GRAMS
Last Answer : Radioisotope is used to diagnose goiter.
Description : The activity of radioisotope changes with:
Last Answer : The activity of radioisotope changes with: A. temperature B. pressure C. chemical enviorment D. none of these
Description : The radioisotope used to study the thyroid gland is (A) Iodine (B) Cobalt (C) Iron (D) Carbon
Last Answer : (A) Iodine
Description : Is a nucleonic sensing method employing usually one or more radioisotope sources and radiation detectors.
Last Answer : Radiation sensing
Description : What is the half life of Iodine-125?
Last Answer : About 60 days.
Description : Which of the following statement(s) is/are true concerning the management of a patient with hemophilia A undergoing an elective surgical operation? a. Concentrates of factor VIII should be given ... observed e. A new recombinant preparation of factor VIII offers the advantage of being virus-free
Last Answer : Answer: b, c, e Although the half-life of factor VIII is 2.9 days in normal individuals, the half-life of factor VIII concentrates is 9 to l8 hours. Levels of 80% to ... infection in the hemophilia population. A new recombinant preparation of factor VIII offers the advantage of being virus-free
Description : The half life of Ig G is (A) 2–8 days (B) 1–4 days (C) 19–24 days (D) 6 days
Last Answer : Answer : C
Description : The half life of radioactive isotope is 3 hour. If the initial mass of isotope were 256 g, the mass of it remaining undecayed after 18 hr is a)12 g b)
Last Answer : The half life of radioactive isotope is 3 hour. If the initial mass of isotope were 256 g, the mass of it remaining ... 4 g B. 8 g C. 12 g D. 16 g
Description : Where is the question I asked earlier today?
Last Answer : It got pushed to editing due to a typo in the subject line. You should have a message stating that you have a question that needs editing. If you fix the typo it will be reinstated.
Description : What is the most anachronistic [something that belongs to an earlier time] job in America today?
Last Answer : Shoveling ho0rse shit, I do that every day. haha
Description : Earlier today, someone made this statement to me..."If your friend is mad at you, then he is not your friend." Huh? Can there be any truth behind this?
Last Answer : In my opinion, that is complete nonsense.
Description : Did you read about the Great White Shark attack in Manhattan Beach California earlier today?
Last Answer : [White Shark says] Go away you stinky jerks! This ocean world is mine! Humans aren’t born to the sea, why the hell do you come here and claim this place yours? Look at tigers, lions… they are fierce, yet they don’t claim the ocean. How dare you? ~
Description : Why did the sunlight affect my TV remote earlier today?
Last Answer : Infra Red from the Sun overpowered your remote.
Description : I'm up sooo much earlier than usual. What should I do differently today?
Last Answer : Exercise! It will boost your metabolism for the day and make your head clear for any task. Also eat a large breakfast about an hour after doing it. Your body will us all the nutrients and give ... energy it needs for the day. (lite dinner, your brain doesnt need all those calories while you sleep)
Description : For the purpose of attracting the provisions of section 138 of the Negotiable Instruments Act, 1881, a cheque has to be presented to the bank A. Within a period of six months B. Within a period of six ... . Within a period of 15 days from the date on which it is drawn D. None of the above.
Last Answer : B. Within a period of six months from the date on which it is drawn or within the period of its validity, whichever is earlier
Description : Convert the binary number 0001.0010 to decimal. 121) A) 1.20 B) 1.40 C) 1.125 D)
Last Answer : C) 1.125
Description : Robert travels from his home to anna park at a distance of 125 miles in 11/4 hrs. He returns to home in 2 hrs 15 mints. His average speed is. a) 50 b) 40 c) 30 d) 20
Last Answer : A Speed from home to annapark: (125*4/11)mph = (500/11)mph Speed from annapark to home: (125*4/9)mph = (500/9) mph Average speed = 2xy / (x+y) mph =[(2*500/11 *500/9) / (500/11+500/9)]mph =(500000/99) / ((4500+5500)/99) =(500000/99) / 10000 /99 =50mph
Description : A candidate scoring 50% in an examination fails by 60 marks , while another candidate scores 75 % mark, gets 40 marks more than the minimum pass marks . Find the minimum pass mark. a) 125 b) 220 c) 140 d) 260 e) 298
Last Answer : Answer: B Let x be the maximum marks, Then (50% of x)+60 = (75% of x)-40 x/2 +60 = 3x/4 -20 60+20 = 3x/4 – x/ 2 X=320 Hence maximum marks = 320 Minimum pass marks = 320/2 + 60 = 220
Description : (i) What per cent of 1 kg is 125 g? (ii) What per cent of 80 m is 24 m? -Maths
Last Answer : answer:
Description : 100 mL of 0.3 M acetic acid is shaken with 0.8 g wood charcoal. The final concentration of acetic acid in the solution after adsorption is 0.125 M. Th
Last Answer : 100 mL of 0.3 M acetic acid is shaken with 0.8 g wood charcoal. The final concentration of acetic acid in the ... g` C. `1.31 g` D. `0.131 g`
Description : How many millilitres of `0.1 NH_(2)SO_(4)` solution will be required for complete reaction with a solution containing 0.125 g of pure `Na_(2)CO_(3)`?
Last Answer : How many millilitres of `0.1 NH_(2)SO_(4)` solution will be required for complete reaction with a solution containing ... .6 mL C. 26.3 mL D. 32.6 mL
Description : A woman’s neglected hangnail has developed into a mild staphylococcal cellulites. Which of the following regimens would be appropriate oral therapy? (a) Dicloxacillin 125 mg q6h (b) Vancomycin 250 mg q6h (c) Methicillin 500 mg q6h (d) Cefazolin 1 g q8h (e) Penicillin V 500 mg q6h
Last Answer : Ans: A
Description : For determine the specific gravity of soil solids, using a pycnometer of 500 cc., the following data is available : Weight of dry empty pycnometer = 125 g Weight of dried soil and pycnometer = 500 g Weight of dried soil and distilled ... of soil solids, is (A) 2.0 (B) 2.25 (C) 2.50 (D) 2.75
Last Answer : (C) 2.50
Description : A composite flat wall of a furnace is made of two materials 'A' and 'B'. The thermal conductivity of 'A' is twice of that of material 'B', while the thickness of layer of 'A' is half that of B. If the temperature ... drop (in °K) across the layer of material 'A' is (A) 125 (B) 133 (C) 150 (D) 160
Last Answer : (D) 160
Description : Do you think all the hormones in our food these days contributes to girls starting their periods at an earlier age?
Last Answer : I believe that the hormones are definitely an influence. I was working in elementary schools for a while and junior highs. The kids when I went to school were not as physically developed as the kids nowadays. Jr. high kids look like they should be going in to college.
Description : . Platinum catalyst used in the earlier days of sulphuric acid manufacture by contact process suffers from the drawback like (A) High cost (B) Fragile nature (C) Easy poisoning tendency (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Post tensioning system (A) Was widely used in earlier days (B) Is not economical and hence not generally used (C) Is economical for large spans and is adopted now a days (D) None of these
Last Answer : Answer: Option D
Description : P,Q, & R can complete a piece of job together in 20 days. All the 3 started working at it together and after 8 days P left. Then Q & R together completed a job in 20 more days. P alone could complete the work in. a) 60 b) 50 c) 40 d) 30
Last Answer : B Work done by P,Q & R in 8 days = 1/20 * 8 =2/5 Remaining work = (1 - 2/5) = 3/5 Now 3/5 work is done by Q & R in 20 days Whole work will be done by Q & R in(20*5/3) =100/3 days (P+Q+R ... (Q+R)'s 1 day work =1/20 - 3/100 =5-3/100 =2/100 =1/50 P alone could complete the work in 50 days..
Description : You're sitting down for breakfast and realize you have 4 bagels left. You know you'll run out in four days so you cut them in half. How many bagels do you have now? -Riddles
Last Answer : 4 Bagels.
Description : Many years ago, a wealthy old man was near death. He wished to leave his fortune to one of his three children. The old man wanted to know that his fortune would be in wise hands. He stipulated that ... man ended up leaving his money to his third child, a daughter. What did his daughter do? -Riddles
Last Answer : Every other day, the daughter sang her father a song.
Description : A and B together can complete a work in 24 days. A alone can complete it in 40 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work? a) 24 days b) 15 days c) 21 days d) 19 days
Last Answer : A B’s 1 day’s work = (1/24 -1/40) =(5-3)/120 =2/120=>1/60 Now, (A + B)’s 1 day’s work = (1/40 +1/60) =(3+2)/120 =5/120 So, A and B together will complete the work in 120/5 = 24 days.
Description : X does half as much work as Yand Z does half as much work as X and Y together. If Z alone can finish the work in 120 days, then together ,all will finish the work in ? a) 14 1/2 b) 40 c) 24 1/2 d)17 1/3
Last Answer : B Z alone can finish the work in 120 days. As given Z does half as much work as X and Y together => (X + Y) can do it in 60 days (X+ Y)s 1 days wok = 1/60. X's 1 days work : Y's 1 days Work = 1 ... (1/90) + (1/120) =(2+4+3)/360 =9/360 = 1/40 All the three together will finish it in 40 days
Description : Which calcium tablet would be better to take ? My wife is 4 months pregnant ... her left leg hurts a lot for 2 days today ... can she take any calcium tablets at the moment ... one of my acquaintances told me ... be good for pregnant women ??? And how many and how many days to eat daily ... ??
Last Answer : Ostogen Coral D Rose can give one. It is much better than Calcin-D .
Description : I have been having pain under my right breast or inside my chest for 2 days now , from today my left side is also a little bit sore. What is the cause of the gas problem ?
Last Answer : It may be due to gastric, so first try gastric medicine for 2/3 days, but if it does not subside, consult a doctor.
Description : A cantilever shaft has a diameter of 6 cm and the length is 40cm, it has a disc of mass 125 kg at its free end. The Young’s modulus for the shaft material is 250 GN/m2. Calculate the static deflection in nm. a) 0.001 b) 0.083c) 1.022 d) 0.065
Last Answer : a) 0.001
Description : Calcium carbonate decomposes into calcium oxide & carbon dioxide Her results:Mass of calcium carbonate before heating = 2.00 g Mass of calcium oxide left after heating = 1.12 g work out the mass of carbon dioxide released during the decomposition?
Last Answer : I am not sure of the answer so can someone help me pls