Question Answers

A black body radiates energy at the rate of E W/ m^2 at a high temperature T K. When the temperture is reduced to T/2 K, the radiant energy will be……… A black body radiates energy at the rate of E W/ m^2 at a high temperature T K. When the temperture is reduced to [...]

Find the roots of the equation 2x^2 – 5x + 3 = 0, by factorization. by factorization. Find the roots of the equation 2x^2 – 5x + 3 = 0 October 4, 2020 Category: Chapter 4 - Quadratic Equations , Maths , NCERT Class 10 ,

Check whether the following are quadratic equations : (x + 2)^3 = x^3 − 4 Check whether the following are quadratic equations : (x + 2)^3 = x^3 − 4 October 4, 2020 Category: Chapter 4 - Quadratic Equations , Maths , NCERT Class 10 ,

The intensity of radiation emitted by the sun has its maximum value at a wavelenght of `510 nm` and that emitted by the north star has the maximum value at `350 nm` If these stars behave like balackbodies the nthe ratio of the surface temperature of the sun and the north star is . At [...]

Check whether the following are quadratic equations : x(2x + 3) = x^2 + 1 Check whether the following are quadratic equations : x(2x + 3) = x^2 + 1 October 4, 2020 Category: Chapter 4 - Quadratic Equations , Maths , NCERT Class 10 ,

A Black body emits radiations of maximum intensity at a wavelength of 5000 A, when the temperature of the body is 1227 degree C. If the body is increased by 1000 degree C, the maximum intensity of emitted radiation would be observed at………….. A Black body emits radiations of maximum intensity at a wavelength of [...]

Check whether the following are quadratic equations : x(x + 1) + 8 = (x + 2)(x – 2) Check whether the following are quadratic equations : x(x + 1) + 8 = (x + 2)(x - 2) October 4, 2020 Category: Chapter 4 - Quadratic Equations , Maths , NCERT Class 10 ,

Check whether the following are quadratic equations : (x−2)^2 + 1 = 2x − 3 Check whether the following are quadratic equations : (x−2)^2 + 1 = 2x − 3 October 4, 2020 Category: Chapter 4 - Quadratic Equations , Maths , NCERT Class 10 ,

Represent the following situations mathematically: (ii) A cottage industry produces a certain number of toys in a day. The cost of production of each toy (in rupees) was found to be 55 minus the number of toys produced in a day. On a particular day, the total cost of production was Rs 750. We would [...]

If wavelengths of maximum intensity of radiations emitted by the sun and the moon are 0.5 x 10^-6 and 10^-4 m respectively, the ratio of their temperatures is……….. If wavelengths of maximum intensity of radiations emitted by the sun and the moon are 0.5 x 10^-6 and 10^-4 m respectively the ratio of their temperatures [...]