Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is
Options
(a) (5/27) (b) (3/23) (c) (7/29) (d) (9/31)
Correct Answer:
(5/27)
Explanation:
No explanation available. Be the first […]
A nuclear reaction is given as 4 ₁H¹→₂He⁴+₀e¹+energy Mention the type of reaction.
Options
(a) fusion (b) fission (c) just a chemical reaction (d) None of these
Correct Answer:
fusion
Explanation:
No explanation […]
The mass number of nucleus is always
Options
(a) Equal to atomic number (b) Less than atomic number (c) More than atomic number (d) Either (a) or ( c)
Correct Answer:
Either (Equal […]
A heavy nucleus at rest breaks into two fragments which fly off with velocities in the ratio 8:1. The ratio of radii of the fragments is
Options
(a) (1:2) (b) (1:4) (c) (4:1) […]
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 […]
Two spherical nuclei have mass numbers 216 and 64 with their radii R₁ and R₂, respectively. The ratio, R₁/R₂ is equal to
Options
(a) (3:2) (b) (1:3) (c) (1:2) (d) (2:3)
Correct Answer:
(3:2)
A deutron is bombarded on ₈O¹⁶ nucleus and α-particle is emitted. The product nucleus is
Options
(a) ₇N¹³ (b) ₅B¹⁰ (c) ₄Be⁹ (d) ₇N¹⁴
Correct Answer:
₇N¹⁴
Explanation:
No explanation available. Be the […]
The wavelength of kα, X-rays produced by an X-ray tube 0.76Å. The atomic number of the anode material of the tube is
Options
(a) 20 (b) 60 (c) 41 (d) 80
Correct Answer:
41
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