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In the Photoelectric effect, Why does increasing the light intensity have no effect on the energy of the electron emitted?

The equation to calculate the energy of an emitted electron is: E = hf - φ , where E is the energy of the electron emitted, h is the Planck's constant, f is the frequency of the light and φ is the work funct...
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Answered by Pankaj K. • Physics tutor
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(From GCSE 2016) Menu A - spaghetti, carne, frutta; Menu B - zuppa di pomodoro, pesce, gelato. Who do you think will like these menus? (a) Luisa loves fish; (b) Davide prefers eating meat; (c) Sandra likes ice cream.

This exercise is about vocabulary. You should spot the key word in each sentence which allows you to pick the right person, then find the corrisponding term in Italian. For example: "Luisa loves fish&qu...
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Answered by Giulia D. • Italian tutor
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(GCSE) A rectangle has the following characteristics: its length is (2x + 5), its width is (3x - 2). The perimeter of the rectangle is 46 cm. What is the value of x?

First of all draw the rectangle, name its sides and annotate its characteristics. Define the data you have and what you are looking for. Write down the general formula for the perimeter of a rectangle: p = a...
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Answered by Giulia D. • Maths tutor
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How do you find the gradient of a straight line?

The gradient of a straight line is the number before the x if it is in the form y=mx+c. So for y=6x+2 the gradient is 6. If the y has a factor, like 2y=6x+2, then you have to divide everything by the factor ...
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Answered by Hebe W. • Maths tutor
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How do you determine the nature of a graphs stationary point? e.g y = 1+2x-x^2

We have our function of y = 1+2x-x 2 The gradient of a stationary (or turning) point is 0, in essence a peak or a trough. In order to determine the gradient, we need to differentiate our function with respec...
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Answered by Joseph A. • Maths tutor
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