When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminating with radiation of wavelength 2λ, the stopping potential is V/4. The threshold wavelength […]
The de-Broglie wavelength associated with an electron accelerated by a potential of 64 V is
Options
(a) 0.153 nm (b) 0.613 nm (c) 1.22 bn (d) 0.302 nm
Correct Answer:
0.153 nm
Explanation: […]
Consider two particles of different masses. In which of the following situations the heavier of the two particles will have smaller de-Broglie wavelength?
Options
(a) Both have a free fall through the same […]
The work function for aluminium is 4.125 eV. The cutoff wavelength for photoelectric effect for aluminium will be
Options
(a) 300 nm (b) 200 nm (c) 350 nm (d) 420 nm
Correct Answer: […]
The velocity of radio-waves is 3×10⁵ km/s. The frequency corresponding to wavelength of 300 m is
Options
(a) 1 MHz (b) 10 MHz (c) 1 kHz (d) 10 kHz
Correct Answer:
1 MHz
Explanation: […]
Light of frequency 8×10¹⁵ Hz is incident on a substance of photoelectric work function 6.125 eV. The maximum kinetic energy of the emitted photoelectron is
Options
(a) 27 eV (b) 22 eV (c) […]
The photoelectric threshold wevelength for potassium (work function being 2 eV) is
Options
(a) 620 nm (b) 310 nm (c) 1200 nm (d) 2100 nm
Correct Answer:
620 nm
Explanation:
No explanation available. […]
Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be
Options
(a) 0 eV (b) 1 eV […]
If threshold wevelength for sodium is 6800 Å, the work function will be
Options
(a) 1.8 eV (b) 2.5 eV (c) 0.14 eV (d) 1.4 eV
Correct Answer:
1.8 eV
Explanation:
No explanation […]
A particle of mass 1mg has the same wavelength as an electron moving with a velocity of 3 x 10⁶ ms⁻¹. The velocity of the particle is: (mass of electron = 9.1 x 10⁻³¹ kg) […]
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