(When unspecified, an object's magnitude is normally assumed to be its apparent magnitude.) The dimmest stars visible to the unaided eye have apparent magnitude 6, while the brightest star in the night sky, Sirius, has apparent magnitude -1.4. ♦ The brightness of a celestial body as seen from Earth is called its apparent magnitude. Because of refinements in measurement after the zero point was assigned, very bright objects have negative magnitudes. An object that is 5 units less than another object on the magnitude scale is 100 times more luminous. Intensity changes with the impact while magnitude remains the same.ĭownload Toppr app for Android and iOS or signup for free.The degree of brightness of a star or other celestial body, measured on a logarithmic scale in which lower numbers mean greater brightness, such that a decrease of one unit represents an increase in brightness by a factor of 2.512. Now we can say that the magnitude of both car and bike is same i.e 100km/hr, but both will have a different impact because of the intensity. On the other hand, speed will not have any impact on the car’s engine. The person riding the bike will most probably damage the engine at such a speed. Let’s understand it with an example – suppose two persons are riding a car and a bike at the same speed of 100km/hr. Q- What is the difference between magnitude and intensity?Īns- A Magnitude is simply a quantitative number while intensity gives us the idea of impact. It is a logarithmic scale in which magnitude increases 10 times with each increase in number. This scale measures the largest magnitude of seismic waves without taking into account the type of wave. We measure the magnitude with the help of the Richter scale. We can say that magnitude is the size of an earthquake. It is a specific value having no relation with distance and direction of the epicentre. Magnitude is the quantitative value of seismic energy. The magnitude of an earthquake provides the information which is helpful in calculating the probability in times to come. What is Magnitude in Physics When it Comes to an earthquakeĭuring the earthquake, energy is released producing seismic waves, which travels in all directions causing vibrations. Similarly, if we multiply a vector with a negative number, its magnitude and direction both will change. If we multiply a vector with a positive number, its magnitude will change but the direction remains the same. We can determine that two vectors will only be equal if both have the same magnitude as well as direction. We call the magnitude of a vector as its absolute value. Some of the vector quantities are – displacement, velocity, acceleration, force, etc. Vector quantities too have magnitude with direction. Similarly, if we need to find the temperature difference between two bodies, we simply subtract the magnitudes of temperature. We add only the magnitudes and unit remains the same. Then its perimeter will be the sum of its three sides, 10m+8m+6m = 24m. Let us look at an example – we have three sides of a triangle as 10m, 8m, and 6m. We can add, subtract, divide and multiply the magnitudes of scalar quantity, just as the ordinary number. We can combine their magnitudes with the ordinary rule of algebra having the same unit. Some of the scalar quantities are mass of an object, temperature of a body, time of the event, and the distance between the two points. Scalar quantities have specific magnitude with the proper unit. We have basically two types of quantity- scalars and vectors. What is Magnitude in Physics When it Comes to Scalar Quantity
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