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Q.

Minimum accelerating potential (volts) needed to accelerate an electron to produce a yellow line ( $λ = 310 nm$ ) in the spectrum, in an electron tube containing some vapours is :

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a

1.2

b

4

c

$6.4 \times 10^{- 19}$

d

$2 \times 10^{- 15}$

answer is B.

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Detailed Solution

Here, the energy can be given as;

$E = \frac{1240}{310} = 4 eV or 4 V$

accelerating potential.

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