Weed index

The energy emitted by the Sun is due to

An electron in a hydrogen atom de-excites from the 4th to the 2nd level. The wavelength of emitted photon falls in which series?

A dielectric placed between the plates of a capacitor increases its:

In a spring-block system executing SHM, at displacement x= A/2, the ratio of kinetic to potential energy is:

A particle moves in a circle of radius 10 cm with a constant speed. Its angular displacement after 2 seconds is π radians. What is its linear speed?

A particle of mass m is placed in a potential V(x) = ax² + bx⁴. For small oscillations around equilibrium, its time period is:

The mass and energy equivalent to 1 a.m.u. respectively are -

What type of radiation is produced by a hot object emitting energy?  

Which of the following is the principle behind the working of a hydraulic press?  

A coil takes 4 A from a 12 V DC source. When connected to a 12 V, 50 rad/s AC source, the current is 2.4 A. The inductance of the coil is: