3 years ago

What determines how many electrons will leave a piece of metal in the photoelectric effect

2 answers:

5 0

The electrons in a piece of metal will leave when the polarized magnesis effect is reppeled and heated up to a certain tempeture.

GalinKa [24]3 years ago

4 0

Answer:

Work function is the minimum energy that is required by an electron to leave the metal target in the photoelectric effect

Explanation:

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Round your answers to one decimal place.this parallel circuit has two resistors at 15 and 40 ohms. what is the total resistance?

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1) The equivalent resistance of two resistors in parallel is given by:
$\frac{1}{R_{eq}}= \frac{1}{R_1}+ \frac{1}{R_2}$
so in our problem we have
$\frac{1}{R_{eq}} = \frac{1}{15 \Omega}+ \frac{1}{40 \Omega}=0.092 \Omega^{-1}$
and the equivalent resistance is
$R_{eq} = \frac{1}{0.092 \Omega^{-1}}=10.9 \Omega$

2) If we have a battery of 12 V connected to the circuit, the current in the circuit will be given by Ohm's law, therefore:
$I= \frac{V}{R_{eq}}= \frac{12 V}{10.9 \Omega}=1.1 A$

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