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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: - A body of mass m is thrown upwards at an angle θ with the horizontal with velocity
- A nucleus disintegrates into two nuclear parts which have their velocities in the ratio
- Heat is flowing through a rod of length 50 cm and area of cross-section 5 cm².
- A rocket is fired upward from the earth surface such that it creates an acceleration
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Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A body of mass m is thrown upwards at an angle θ with the horizontal with velocity
- A nucleus disintegrates into two nuclear parts which have their velocities in the ratio
- Heat is flowing through a rod of length 50 cm and area of cross-section 5 cm².
- A rocket is fired upward from the earth surface such that it creates an acceleration
- The equivalent resistance of two resistors connected in series is 6 Ω
Topics: Dual Nature of Matter and Radiation (150)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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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