Search our library of A Level questions

Top answers

All subjects

A Level

What would happen to n and Emax when a) the intensity is reduced to 1/2 I but the wavelength λ is unchanged? b) the wavelength λ is reduced but the intensity is unchanged?

FULL QUESTION: Electromagnetic radiation of wavelength λ and intensity I, incident on a metal surface, causes n electrons to be emitted per unit time. The maximum kinetic energy of the electrons is Emax. ...

Answered by Kim E. • Physics tutor

7828 Views

Find the derivative (dy/dx) of the curve equation x^2 -y^2 +y = 1.

Most of the differentiation problems require us to apply one of the well known rules, be it product rule, quotient rule or chain rule. But those problems have one thing in common: explicite formula for y...

Answered by Adam G. • Maths tutor

5683 Views

Explain the dipoles on the following covalent bonds: Cl-Cl, H-Cl

A dipole is a result of a seperation of charge between two bonded atoms, when one atom has a slight positive charge and the other a slight negative charge. This is a result of the shared pair of electrons...

Answered by Amber C. • Chemistry tutor

15310 Views

What are the differences between glycogen, starch and cellulose?

All three of these are carbohydrate polymers, formed from glucose monomers.

Glycogen and starch are both polymers of alpha glucose. These long chains of alpha glucose molecules, joined end-to-end, ...

Answered by Matt J. • Biology tutor

43575 Views

What do you think of the influence of music on young people? Use the subjective mood in your response. (Answer in French)

La musique offert une façon pour les jeunes d'échapper la vie quotidienne. Ils peuvent se détendre et en plus s'identifier avec les paroles, pour qu'ils sachent qu'ils ne sont pas seuls. Surtout pendant c...

Answered by Lucy F. • French tutor

2396 Views