Can you explain the answer of this question below:The number of base SI units is:A:5B:7C:6D:2The answer is b.

Question

Answer

Base system means fundamental physical quantities and there are 9 fundamental physical quantities but only 7 have units so number of base SI units is 7.

Answer

There are 7 fundamental units in physics. . (1)Mass (2)Length (3)Time (4)Electric Current (5)Thermodynamic Temperature (6)Luminous Intensity & (7) Amount of substance. .

Answer

Base si system means fundamental physical quantities and there are 9 fundamental physical quantities but only 7 have units so number of base SI units is 7

Answer

SI units or International System of Units is a standard system of measurement used worldwide. It comprises seven base units, which are used to define all other units of measurement. The correct answer to the given question is option 'B', which means there are seven base SI units.

Explanation:

SI units are based on the metric system, which uses the decimal system of measurement. The seven base units of SI are defined as follows:

1. Meter (m): It is the unit of length and is defined as the distance traveled by light in a vacuum in 1/299,792,458 seconds.

2. Kilogram (kg): It is the unit of mass and is defined as the mass of the International Prototype of the Kilogram.

3. Second (s): It is the unit of time and is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom.

4. Ampere (A): It is the unit of electric current and is defined as the constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 meter apart in a vacuum, would produce between these conductors a force equal to 2 x 10-7 newton per meter of length.

5. Kelvin (K): It is the unit of temperature and is defined as the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.

6. Mole (mol): It is the unit of amount of substance and is defined as the amount of substance that contains as many elementary entities as there are atoms in 0.012 kilograms of carbon-12.

7. Candela (cd): It is the unit of luminous intensity and is defined as the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.

Conclusion:

In conclusion, the correct answer to the given question is option 'B', which means there are seven base SI units. These seven base units are used to define all other units of measurement in the SI system.

Answer

3

Answer

7

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Can you explain the answer of this question below:The number of radial nodes for 3p orbital is __________.A:3B:4C:2D:1The answer is d.

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Can you explain the answer of this question below:One atomic mass unit (amu) is closest to: