Question Answers

1. In Fig. 6.28, find the values of x and y and then show that AB ll CD. 1. In Fig. 6.28 find the values of x and y and then show that AB ll CD. October 15, 2020 Category: Chapter 6 - Lines and Angles , Maths , NCERT Class 9 ,

The wavelength of radiation required to excite the electron from the first orbit to the third orbit in a doubly ionized lithium atom will be The wavelength of radiation required to excite the electron from the first orbit to the third orbit in a doubly ionized lithium atom will be October 15, 2020 Category: Uncategorised [...]

6. It is given that angle XYZ = 64° and XY is produced to point P. Draw a figure from the given information. If ray YQ bisects angle ZYP, find angle XYQ and reflex angle QYP. 6. It is given that angle XYZ = 64° and XY is produced to point P. Draw a figure [...]

5. In Fig. 6.17, POQ is a line. Ray OR is perpendicular to line PQ. OS is another ray lying between rays OP and OR. Prove that angle ROS = ½ (angle QOS – angle POS). 5. In Fig. 6.17 POQ is a line. Ray OR is perpendicular to line PQ. OS is another ray [...]

4. In Fig. 6.16, if x+y = w+z, then prove that AOB is a line. 4. In Fig. 6.16 if x+y = w+z then prove that AOB is a line. October 15, 2020 Category: Chapter 6 - Lines and Angles , Maths , NCERT Class 9 ,

3. In Fig. 6.15, angle PQR = angle PRQ, then prove that angle PQS = angle PRT. 3. In Fig. 6.15 angle PQR = angle PRQ then prove that angle PQS = angle PRT. October 15, 2020 Category: Chapter 6 - Lines and Angles , Maths , NCERT Class 9 ,

2. In Fig. 6.14, lines XY and MN intersect at O. If angle POY = 90° and a : b = 2 : 3, find c. 2. In Fig. 6.14 find c. lines XY and MN intersect at O. If angle POY = 90° and a : b = 2 : 3 October 15, 2020 [...]

The total energy of an electron in the ground state of hydrogen atom is -13.6 eV. The potential energy of an electron in the ground state of Li^2+ ion will be The total energy of an electron in the ground state of hydrogen atom is -13.6 eV. The potential energy of an electron in the [...]

A hydrogen-like atom emits radiations of frequency 2.7 * 10^15 Hz when it makes a transition from n = 2 to n = 1. The frequency emitted in a transition from n = 3 to n = 1 will be A hydrogen-like atom emits radiations of frequency 2.7 * 10^15 Hz when it makes a [...]

An electron in H atom makes a transition from n = 3 to n = 1. The recoil momentum of H atom will be An electron in H atom makes a transition from n = 3 to n = 1. The recoil momentum of H atom will be October 15, 2020 Category: Uncategorised (JEE Advanced [...]