Find the velocity of an electron so that its momentum is equal to the photon of wavelength 5200 Å ?

Question

Find the velocity of an electron so that its momentum is equal to the photon of wavelength 5200 Å ? (A) 700 ms- 1 (B) 1000 ms- 1 (C) 1400 ms- 1 (D) 2800 ms- 1

Tardigrade Admin · Accepted Answer

According to De Broglie's equation Momentum, p = (h/λ ) or v=(h/m λ )=(6.62 × 10- 34/9.1 × 10- 31 × 5.2 × 10- 7) =1.4× 103 ms- 1=1400 ms- 1

Q. Find the velocity of an electron so that its momentum is equal to the photon of wavelength 5200 $Å$ ?

$700 m s^{- 1}$

$1000 m s^{- 1}$

$1400 m s^{- 1}$

$2800 m s^{- 1}$

According to De Broglie's equation Momentum,
$p = \frac{h}{λ}$
or $v = \frac{h}{mλ} = \frac{6.62 \times 1 0 ^{- 34}}{9.1 \times 1 0 ^{- 31} \times 5.2 \times 1 0 ^{- 7}}$
$= 1.4 \times 1 0^{3} m s^{- 1} = 1400 m s^{- 1}$

Q. Find the velocity of an electron so that its momentum is equal to the photon of wavelength 5200 Å ?

700ms−1

1000ms−1

1400ms−1

2800ms−1