A metal surface is exposed to 500 nm radiation. The threshold frequency of the metal for photoelectric current is 4.3 ×1014 Hz. The velocity of ejected electron is ___________×105 ms–1. (Nearest integ

Question

A metal surface is exposed to 500 nm radiation. The threshold frequency of the metal for photoelectric current is 4.3 ×1014 Hz. The velocity of ejected electron is ___________×105 ms–1. (Nearest integer) [[Use : h = 6.63×10–34 Js, me = 9.0×10–31 Kg] ,d /kkrq lrg ij 500 nm dk fofdj.k Mkyk x;k gSA izdk'k fo|qr /kkjk ds fy, /kkrq dh nsgyh vko`fÙk 4.3 ×1014 Hz. gSA mRlftZr bysDVªkWu dk osx gS ___________× 105 ms–1. (fudVre iw.kk±d esa) [[iz;ksx djsa : h = 6.63×10–34 Js, me = 9.0×10–31 Kg]

Prashant Kotian · Accepted Answer

Correct answer: .. 8 500 3 C nm           = 6 × 1014 Hz Hz 3 . 14    For PEE,      K h h KE =   0 10 . h h h           (6 × 1014 – 4.3 × 1014) = 6.6 × 1.7 × 10–20 J K.E. = 1 mv2; v = m . E . K 2 V = 20 1 . 10 . 6 . 2       = 10 .  = 5 × 105 m/s

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