Berapa panjang gelombang maksimum yang dapat menyebabkan elektron foto terpancar dari natrium? Berapa energi kinetik maksimum dari elektron foto jika cahaya 2.000 Å jatuh pada permukaan natrium?

Berapa panjang gelombang maksimum yang dapat menyebabkan elektron foto terpancar dari natrium? Berapa energi kinetik maksimum dari elektron foto jika cahaya 2.000 Å jatuh pada permukaan natrium? $undefined$

Jawaban:

$begin mathsize 14px style F u n g s i space k e r j a space n a t r i u m equals space 2 comma 3 space eV 1 space eV equals 1 comma 6 cross times 10 to the power of negative 19 end exponent space straight J lambda equals 2.000 space straight Å equals 2 cross times 10 to the power of negative 7 end exponent space straight m end style$

Ditanyakan: Panjang gelombang maksimum dan energi kinetik maksimum?
Jawab:

Panjang gelombang maksimum natrium
$begin mathsize 14px style E equals h c over lambda subscript 0 lambda subscript 0 equals fraction numerator h c over denominator E end fraction lambda subscript 0 equals fraction numerator open parentheses 6 comma 63 cross times 10 to the power of negative 34 end exponent close parentheses open parentheses 3 cross times 10 to the power of 8 close parentheses over denominator open parentheses 2 comma 3 close parentheses open parentheses 1 comma 6 cross times 10 to the power of negative 19 end exponent close parentheses end fraction lambda subscript 0 equals fraction numerator 19 comma 89 cross times 10 to the power of negative 26 end exponent over denominator 3 comma 68 cross times 10 to the power of negative 19 end exponent end fraction lambda subscript 0 equals 5 comma 4 cross times 10 to the power of negative 7 end exponent lambda subscript 0 equals 5.400 space straight Å end style$

Energi kinetik maksimum
$begin mathsize 14px style E k subscript m a x end subscript equals E minus E subscript 0 E k subscript m a x end subscript equals fraction numerator h c over denominator lambda end fraction minus E subscript 0 E k subscript m a x end subscript equals fraction numerator open parentheses 6 comma 63 cross times 10 to the power of negative 34 end exponent close parentheses open parentheses 3 cross times 10 to the power of 8 close parentheses over denominator open parentheses 2 cross times 10 to the power of negative 7 end exponent close parentheses end fraction minus 2 comma 3 open parentheses 1 comma 6 cross times 10 to the power of negative 19 end exponent close parentheses E k subscript m a x end subscript equals 9 comma 945 cross times 10 to the power of negative 19 end exponent minus 3 comma 68 cross times 10 to the power of negative 19 end exponent E k subscript m a x end subscript equals 6 comma 265 cross times 10 to the power of negative 19 end exponent space straight J E k subscript m a x end subscript equals 3 comma 9 space eV end style$

Jadi, panjang gelombang maksimum natrium adalah 5.400 Å, dan energi kinetik maksimum dari elektron foto adalah 3,9 eV.

Ruangguru

RUANGGURU HQ

Jl. Dr. Saharjo No.161, Manggarai Selatan, Tebet, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12860

Coba GRATIS Aplikasi Ruangguru

Download di Google Play

Download di Appstore

Produk Ruangguru

Produk Lainnya

Bantuan & Panduan

Hubungi Kami

081578200000

[email protected]

02140008000

Ikuti Kami

Instagram

Facebook

Twitter

Youtube