A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV.
A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can be detect a signal of wavelength
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(a) 4000 nm (b) 6000 nm (c) 4000Å (d) […]
AIPMT2009
A transistor is operated in common-emitter configuration at Vᵥ = 2 V such that a change
A transistor is operated in common-emitter configuration at Vᵥ = 2 V such that a change in the base current from 100 µA to 200 µA produces a change in the collector current from 5 […]
Monochromatic light of wavelength 667 nm is produced by a helium neon laser
Monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9 mW. The number of photons arriving per second on the average at a large irradiated by this […]
The number of photo electrons emitted for light of a frequency v
The number of photo electrons emitted for light of a frequency v (higher than the threshold frequency v₀) is proportional to:
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(a) Threshold frequency (v₀) (b) Intensity of light (c) Frequency of […]
A student measures the terminal potential difference (V) of a cell
A student measures the terminal potential difference (V) of a cell (of emf E and internal resistance r) as a function of the current (I) flowing through it. The slope and intercept, of the graph […]
In a Rutherford scattering experiment when a projectile of charge Z₁ and mass M₁
In a Rutherford scattering experiment when a projectile of charge Z₁ and mass M₁ approaches a target nucleus of charge Z₂ and mass M₂, the distance of closest approach is r. The energy of the […]
Power dissipated in an LCR series circuit connected to an a.c source of emf ? is
Power dissipated in an LCR series circuit connected to an a.c source of emf ? is
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(a) ?ￂﾲ √ [ R² + ( L? – 1 / C?)² ] / R (b) […]
An explosion blows a rock into three parts. Two parts go off at right angles to each other
An explosion blows a rock into three parts. Two parts go off at right angles to each other. These two are, 1 kg first part moving with a velocity of 12 ms⁻¹ and 2 kg […]
An engine pumps water continuously through a hose. Water leaves the hose
An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate of at which […]
A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily
A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? […]