QUES: In quantum mechanics, energy is defined in terms of the energy operator as a time derivative of the wave function. The Schrödinger equation equates the energy operator to the full energy of a particle or a system. Its results can be considered as a definition of measurement of energy in quantum mechanics. The Schrödinger equation describes the space- and time-dependence of a slowly changing (non-relativistic) wave function of quantum systems. The solution of this equation for a bound system is discrete (a set of permitted states, each characterized by an energy level) which results in the concept of quanta. In the solution of the Schrödinger equation for any oscillator (vibrator) and for electromagnetic waves in a vacuum, the resulting energy states are related to the frequency by Planck's relation:  (where  is Planck's constant and  the frequency). In the case of an electromagnetic wave these energy states are called quanta of light or photons.

In quantum mechanics, what is defined in terms of the energy operator as a time derivative of the sine function?
What is the answer?
ANS: unanswerable
QUES: Nasser's Egyptian detractors considered him a dictator who thwarted democratic progress, imprisoned thousands of dissidents, and led a repressive administration responsible for numerous human rights violations. Islamists in Egypt, particularly members of the politically persecuted Brotherhood, viewed Nasser as oppressive, tyrannical, and demonic. Liberal writer Tawfiq al-Hakim described Nasser as a "confused Sultan" who employed stirring rhetoric, but had no actual plan to achieve his stated goals.

Whad did Nasser's enemies call him?
What is the answer?
ANS: dictator
QUES: 11th Street is in two parts. It is interrupted by the block containing Grace Church between Broadway and Fourth Avenue. East 11th streets runs from Fourth Avenue to Avenue C and runs past Webster Hall. West 11th Street runs from Broadway to West Street. 11th Street and 6th Avenue was the location of the Old Grapevine tavern from the 1700s to its demolition in the early 20th century.

When was the Old Grapevine tavern demolished?
What is the answer?
ANS:
early 20th century