You are deciding between using a 5000 ohm thermistor, Material System 1, or a class A RTD for measuring the temperature of a critical circuit board of a smart phone near 30°C. The accuracy must be within 0.25°C throughout the range of measurement. Neither speed of response nor component cost is an issue. The 5000-ohm thermistor is defined in the table below. R25 Material System B Value 25/85°C Code R25°C 1% 500 500 10002 3540 : 1% 3627 +1% 3540 - 1% 3627 1% 3540 +/- 1% 3540 - 1% 1000 2A 1800 Maximum Operating Temperature °F (°C) 257 (125) 257 (125) 257 (125) 257 (125) 257 (125) 257 (125) 257 (125) 311 (155) 311 (155) 311 (155) 311 (155) 311 (155) 311 (155) 2000 2000 2200 3627 - 1% 3977 -0.75% 2700 3000 NK222C1'1 NK272C1'1 NK302011 NK502C1'1 NK502C4A 1 NK103C1'1 3977 -0.75% 3977 -/- 075% 3977 -0.75% 3436 - 1% 3977 - 075% 5000 5000 10000 Given the tolerance on B for the thermistor, what is the absolute value of the accuracy of the reading in C that you will get on the thermistor at 30°C? (Type in a three decimal number)

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

i think the answer would be b

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

answer and explanation;