The de-broglie wavelength of an electron in 4th orbit is ( where, r= radius of 1st orbit)
Options
(a) 2πr (b) 4πr (c) 8πr (d) 16πr
Correct Answer:
8πr
Explanation:
No explanation available. […]
A gas of monoatomic hydrogen is bombarded with a stream of electrons that have been accelerated from rest through a potential difference of 12.75 volt. In the emission spectrum one can observe lines of
An atom bomb works on the principle of
Options
(a) nuclear fission (b) nuclear fusion (c) α-decay (d) β-decay
Correct Answer:
nuclear fission
Explanation:
No explanation available. Be the first to write the […]
A galvanometer of resistance 50Ω is connected to a battery of 3 V along with a resistance of 2950 Ω in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In […]
A capacitor of 2.5 μF is charged through a resistor of 4 MΩ. In how much time will potential drop across capacitor will become 3 times that of resistor (ln2=0.693)
Options
(a) 13.86 […]
The physical quantities not having same dimensions are
Options
(a) Speed and (μ₀ε₀)⁻¹/₂ (b) Torque and work (c) Momentum and Planck’s constant (d) Stress and Young’s modulus
Correct Answer:
Momentum and Planck’s constant
The unit of reactance is
Options
(a) ohm (b) volt (c) mho (d) newton
Correct Answer:
ohm
Explanation:
No explanation available. Be the first to write the explanation for this question by […]
A neutron is moving with a velocity u.It collides head on and elastically with an atom of mass number A. If the initial kinetic energy of the neutron be E. How much kinetic energy will […]
A force of 10N is applied on a body for 3 sec and the corresponding displacement 6 m. The power of the source is
Options
(a) 20 W (b) 25 W (c) 40 W […]
The frequency of fundamental tone in an open organ pipe of length 0.48 m is to 320 Hz. Speed of sound is 320 m/s. Frequency of fundamental tone in closed organ pipe will be
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