Question

`phi  "and"  phi_2  (phi_1 > phi_2)` are the work functions of metals A and B. When light of same wavelength is incident on A and B, the fastest emitted electrons from A are ____________ those emitted from B.

Options

• more energetic than

• less energetic than

• of the same energy as

• more or less energetic (depending on intensity of light) than

Answer 1

`phi  "and"  phi_2  (phi_1 > phi_2)` are the work functions of metals A and B. When light of same wavelength is incident on A and B, the fastest emitted electrons from A are less energetic than those emitted from B.

Explanation:

`("K.E.")_"A" = "hv" - phi_1`

`("K.E.")_"B" = "hv" - phi_2`

`"As"  phi_1 > phi_2  Rightarrow ("K.E.")_"A" < ("K.E.")_"B"`