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If photons of wavelength 0.1nm are incident on a 2m x 2m Solar Panel at a rate of 2.51x10^15s^-1, calculate the intensity, I, of the photons on the Solar Panel.

If wavelength = 0.1nm, we know (as E=hc/λ), the energy provided by each photon, E= 1.99x10¹⁵J .Therefore, if they hit the panel at a rate of 2.51x10¹⁵

Answered by Sam H. • Physics tutor

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Why is a pendulum with a bob of the same size but larger mass than another bob damped more lightly?

The heavier bob has more kinetic energy/potential energy/momentum for any given amplitude of the two pendulums due to its larger mass, as each of these three quantities depend linearly on mass. The dampin...

Answered by Lucy S. • Physics tutor

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How does conservation of momentum work when at least one of the bodies in the problem changes mass?

The principle to use here is the principle of conservation of linear momentum, the question asks whether we have to modify this principle or use it in a different way to solve physics problems that have a...

Answered by Helen C. • Physics tutor

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Where does the formula for gravitational potential come from? Why the minus sign?

We know Newton's Law of Gravitation, which states that the force F between two bodies of masses M and m respectively, separated by distance R, can be given by: F = GMm/R<...

Answered by Kieren M. • Physics tutor

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Compare and contrast elastic and inelastic collisions

An elastic collision is a collision where there is no loss of kinetic energy. Therefore, it can be said that, since KE is conserved, momentum is conserved. In other words the momentum and total kinetic en...

Answered by Matt R. • Physics tutor

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