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When should I use the passé composé, and when I use the imperfect tense?

The passé composé is used for completed actions and events that occurred at a specific time, whereas the imperfect is u...

Answered by George N. • French tutor

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Describe how a PET scan works?

A PET scan which is known as Positron Emission Topography involves passing a positron emitting source through a patient. The source used for a PET scan is FDG which contains Fluorine-18. A positron emitte...

Answered by Arjun S. • Physics tutor

7481 Views

Describe and explain the photoelectric effect in terms of photons interacting with the surface of a metal.

The photoelectric effect occurs when individual photons are incident on a clean metal surface. The photons are absorbed by electrons in the clean metal surface and they are released as photoelectrons. The...

Answered by Arjun S. • Physics tutor

7164 Views

Describe and explain the life cycle of a star?

A star begins its life from Hydrogen gas. Gas particles of Hydrogen gas are brought together due to the gravitational force of attraction between them. There is an increase in Kinetic Energy of these gas ...

Answered by Arjun S. • Physics tutor

2648 Views

What is 'Pathetic Fallacy' and what is its significance in literature?

Pathetic fallacy is a literary device that is used to create mood and atmosphere. It is the use of the weather or other atmospheric devices to reflect the mood and tone of the characters and their situati...

Answered by Charlie W. • English tutor

13790 Views