What is magnitude?

Answer 1

magnitude is a value of any physical quantity i.e. velocity,mass etc..

Answer 2

If the velocity of a car is given as 60 km/hour towards east, then its magnitude is 60 km/hour and the direction is towards east.

In mathematics, the magnitude of - 5 is written as -5 between two vertical lines and is equal to 5. Magnitude is always positive. Magnitude of 5 is also 5.
If a body does work equal to - 10 joules, then the magnitude of work done is 10 joules.

Answer 3

The brightness of an astronomical object, expressed on a unique numerical scale. The stellar magnitude scale is logarithmic and is inverted in that fainter objects have numerically larger magnitudes. Although used primarily for stars, the stellar magnitude scale can also be used to express the brightness of the Sun, planets, asteroids, comets, nebulae, galaxies, and even background radiation.

Since the brightness of any object varies with wavelength, many different magnitude scales have been defined corresponding to different spectral regions, bandwidths, and methods of observation. Visual magnitudes, corresponding to the sensitivity of the human eye centered in the yellow part of the spectrum, are usually implied if the type is unspecified.

The star catalog of Hipparchus (about 150 B.C.) is thought to have contained approximately 850 naked-eye stars classified according to brightness. The 15 or so brightest stars were referred to as stars of the first magnitude, while second-magnitude stars were on the average two or three times fainter, and so on. The scale is logarithmic because intervals that are perceived as equal intervals are, in fact, equal brightness ratios.

Measurements of brightness ratios in the nineteenth century showed that, on average, stars of the sixth magnitude (near the limit of naked-eye vision) were about 100 times fainter than those of the first. On the scale introduced by N. R. Pogson in 1856 and universally adopted, an interval of 5 magnitudes corresponds to a factor of exactly 100, so that each magnitude corresponds to a factor of 1005 ? 2.512 ·. The zero point of the Pogson scale was set so that most stars retained their customary magnitudes.

An attractive feature of the magnitude scale is the ease with which fractional magnitudes can be interpreted. Each change of 1% in the brightness of an object corresponds to a change of 0.01 in the magnitude, and this numerical correspondence holds to good accuracy for changes up to about 30%.

A distinction is made between the apparent magnitude of an object viewed from the Earth and its absolute magnitude, which measures the object's intrinsic luminosity by indicating its apparent magnitude as seen from a standard distance. The absolute magnitude may be defined as the apparent magnitude an object would have if viewed from a distance of 10 parsecs (1 pc = 3.26 light-years = 1.92 × 1013 mi = 3.09 × 1013 km)..

Answer 4

The magnitude of an object is the relative size or extent.
Furthermore, in astronomy the magnitude is the apparent brightness of a celestial body expressed on a numerical scale on which bright stars have a low value.

Answer 5

i think it's a term which we find more often in vectors
well magnitude is some thing which represents some thing abut the nature or state of the body
some thing like u weigh 65 kgs here 65 is called as magnitude
bike is moving with a velocity of 24mph north east
here 24mph is the magnitude which gives us about the speed pf the vehicle and northeast is its direction.

Answer 6

Magnitude essentially refers to the size of any given quantity to be measured

Answer 7

Magnitude gives only the quantity (or quantum) of an event or an object.
It doesn't gives any direction or location.
for example:-
i) Richter scale is used to measure the intensity of earthuake. It does not indicates any place of occurance.
ii) Wind speed is measured in miles per hour or kilometers per hour and it does not gives any direction.

for more refer to the following link:-

Answer 8

It's like the length of a vector, regardless of direction. So, your speedometer is an example of magnitude. It doesn't care what direction you're going.

Answer 9

in simple terms:
Let the length of a rod be 30cm, then 30 will be the magnitude in this case while 'cm' will be the unit .

Answer 10

magnitude is what gives us the quantity of a thing rather than quality.
it will not have any direction.