PART - 1 CH - 1 Units and Measurements — Physics STD 11 Science — Question

If the speed of a particle moving. at a relativistic speed is doubled, its linear momentum will:

The algebraic sum of the moments of masses of various particles of a system about its centre of mass is _______.

Explain why (or how):
A violin note and sitar note may have the same frequency, yet we can distinguish between the two notes,

When is the tension maximum in the string of a simple pendulum?

The length of the string of a simple pendulum is measured with a metre scale to be 90.0cm. The radius of the bob plus the length of the hook is calculated to be 2.13cm using measurements with a slide callipers. What is the effective length of the pendulum? (The effective length is defined as the distance between the point of suspension and the centre of the bob.)

When a semiconducting material is doped with an impurity, new acceptor levels are created. In a particular thermal collision, a valence electron receives an energy equal to 2kT and just reaches one of the acceptor levels. Assuming that the energy of the electron was at the top edge of the valence band and that the temperature T is equal to 300K, find the energy of the acceptor levels above the valence band.

What is the cause of excess pressure inside a soap bubble?

At which point in the trajectory of the ball thrown upward the acceleration is perpendicular to velocity?