Search our library of Physics questions

Top answers

Physics

All levels

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

7314 Views

What is terminal velocity and what causes it?

Initially, when you drop an object the only force acting on it is gravity. This accelerates the object towards the ground. As the objects speed increases so does the force of air resitance acting on the o...

Answered by Sam M. • Physics tutor

9394 Views

Explain what is meant by the mass defect of an atomic nucleui

Correct answer: the positive difference between the separated and combined mass of the nucleons.

Explaination: The nculeons are held together by a binding force- ie the strong force, intermedicate...

Answered by Roisin G. • Physics tutor

2229 Views

A torch uses 15watts of energy. It uses two 1.5volt batteries connected in series. What is the resistance in the circuit of the torch?

In order to answer this question, we need a formula which relates resistance to voltage and power. We don't already know this formula, but can create it from two formulae we already know: P=IV & V=IR....

Answered by Hugo W. • Physics tutor

2188 Views