Which radiations are used in tratement of muscles ache?
Options
(a) Ultraviolet (b) Infrared (c) Microwave (d) x-rays
Correct Answer:
Infrared
Explanation:
Infrared rays are used in physical therapy.
Two parallel beams of positron moving in the same direction will
Options
(a) not interact with each other (b) repel each other (c) attract each other (d) be deflected normal to the plane […]
To measure the roughness of the surface of a material, which of the following microscope is preferred for better result output?
Options
(a) Compound microscope (b) Electron microscope (c) Atomic force microscope (d) […]
Dispersion of light is caused due to
Options
(a) intensity of light (b) density of medium (c) wavelength (d) None of the above
Correct Answer:
wavelength
Explanation:
The spliting of white light into its […]
The half life of radium is 1620 yr and its atomic weight is 226 kg per kilo mol. The number of atoms that will dacay from its 1g sample per second will be (take, Avogadro’s […]
The condition for obtaining secondary maxima in the diffraction pattern due to single slit is
Options
(a) a sin θ=nλ/2 (b) a sin θ=(2n-1)λ/2 (c) a sin θ=nλ (d) a sin θ=(2n-1)λ
Correct […]
The liquid-crystal phase of a matter is called
Options
(a) mesophase (b) gel (c) crystalline liquid (d) None of these
Correct Answer:
mesophase
Explanation:
No explanation available. Be the first to write the […]
The electrons are emitted in the photoelectric effect from a metal surface
Options
(a) Only if the temperature of the surface is high (b) with a maximum velocity proportional to the frequency of […]
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: […]
In a circuit, L,C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45⁰. The value of C is
Options
(a) 1/πf(2πfL+R) (b) […]
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