| ⇦ | 
| ⇨ |
The speed of an electron having a wavelength of 10⁻¹⁰ m is
Options
(a) 6.26×10⁶ m/s
(b) 5.25 x10⁶ m/s
(c) 7.25×10⁶ m/s
(d) 4.24×10⁶ m/s
Correct Answer:
7.25×10⁶ m/s
Explanation:
λ = h / momentum = h / mv
v = h / mλ = 6.6 × 10⁻³⁴ / (9 × 10⁻³¹) × 10⁻¹°
v = 7.25 × 10⁶ ms⁻¹
Related Questions: - Two identical cells of the same e.m.f. and same internal resistance
- The moment of inertia of a uniform circular disc of radius R and mass M about an axis
- A series L-C-R circuit contains inductance 5 mH, capacitance 2 μF and resistance
- Pure Si at 500 K has equal number of electron (nₑ) and hole (nₕ) concentrations
- The resistances of the four arms P,Q,R and S in a Wheatstone’s bridge
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two identical cells of the same e.m.f. and same internal resistance
- The moment of inertia of a uniform circular disc of radius R and mass M about an axis
- A series L-C-R circuit contains inductance 5 mH, capacitance 2 μF and resistance
- Pure Si at 500 K has equal number of electron (nₑ) and hole (nₕ) concentrations
- The resistances of the four arms P,Q,R and S in a Wheatstone’s bridge
Topics: Dual Nature of Matter and Radiation (150)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
P=h/lamba…..1equ
P= momentum
H=Planck’s constant
Lamba= wavelength
And
P=MV…..2 equ
M= mass
V= speed
Put 2 in 1
MV=h/lamba
9.1×10^-31*v=6.6×10^-34/10^-10
By solving u get the value of v
V=0.725*10^7=7.25*10^6