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What is the passé simple?

The passé simple is one of French’s lesser known tenses, since it has now mostly fallen out of fashion. One reason for its decline is the passé composé, with which French students will b...

Answered by Sam M. • French tutor

2319 Views

How should I prepare my essays for the exam?

The first question to address here is; what genre is the material you have been learning in class fits. Is it drama, poem, prose, non-fiction? From here, we can look at past exam questions, and observe a ...

Answered by Cat A. • English tutor

1129 Views

How do you describe the process of recrystallisation to purify a product?

When describing the process of recrystallisation, it is important that every step is mentioned. Firstly, the impure product must be dissolved in a minimum amount of hot solvent. The hot s...

Answered by Chris R. • Chemistry tutor

13066 Views

Electrons moving in a beam have the same de Broglie wavelength as protons moving in a separate beam. The proton beam moves at a speed of 3.1 x 10^4 m/s. What is the speed of the electrons?

From the data sheet, the de Broglie wavelength, 𝜆 = h/p = h/(mv)
The electron wavelength equals the proton wavelength so: 𝜆_e = 𝜆_p
So:

Answered by Alexandra G. • Physics tutor

3044 Views

Simplify √ 12 + √ 75

First, the surds need to be simplified. Surds can be simplified by finding the highest square number that is a factor of the number in the square root.√12 = √(4 x 3) = √4 x √3 = 2√3√75 = √(25 x 3) = √25 x...

Answered by Georgia R. • Maths tutor

16076 Views