Chapter 18 – Atoms and Nuclei
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If λcu is the wavelength of Kα, Xray line of copper (atomic number 29) and λMO is the wavelength of the Kα, Xray line of molybdenum (atomic number 42), then the ratio λCu/λMo is close to
15
Sep
If λcu is the wavelength of Kα, Xray line of copper (atomic number 29) and λMO is the wavelength of the Kα, Xray line of molybdenum (atomic number 42), then the ratio λCu/λMo is close to If λcu is the wavelength of Kα then the ratio λCu/λMo is close to Xray line of copper (atomic [...]
A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons corresponding to these wavelengths are u1 and u2, respectively. If the ratio u1:u2 = 2:1 and hc=1240 e V nm, the work function of the metal is nearly
15
Sep
A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons corresponding to these wavelengths are u1 and u2, respectively. If the ratio u1:u2 = 2:1 and hc=1240 e V nm, the work function of the metal is nearly A metal surface is illuminated [...]
The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561A˚. The wavelength of the second spectral line in the Balmer series of singly ionized helium atom is
15
Sep
The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561A˚. The wavelength of the second spectral line in the Balmer series of singly ionized helium atom is The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561A˚. The wavelength of the second spectral [...]
Photoelectric effect experiments are performed using three different metal plates p,q and r having work functions Qp=2.0 eV, Qq=2.5 eV and Qr=3.0 eV, are respectively. A light beam containing wavelength of 550 nm,450 nm and 350 nm with equal intensities illuminates each of the plates. The correct I−V graph for the experiment is
15
Sep
Photoelectric effect experiments are performed using three different metal plates p,q and r having work functions Qp=2.0 eV, Qq=2.5 eV and Qr=3.0 eV, are respectively. A light beam containing wavelength of 550 nm,450 nm and 350 nm with equal intensities illuminates each of the plates. The correct I−V graph for the experiment is 450 nm [...]
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450 nm and 350 nm with equal intensities illuminates each of the plates. The correct I−V graph for the experiment is ,
are respectively. A light beam containing wavelength of 550 nm ,
Photoelectric effect experiments are performed using three different metal plates p ,
q and r having work functions Qp=2.0 eV ,
Qq=2.5 eV and Qr=3.0 eV ,
Which one o f the following statements is WRONG in the context of X−rays generated from an X−ray tube ?
15
Sep
Which one o f the following statements is WRONG in the context of X−rays generated from an X−ray tube ? Which one o f the following statements is WRONG in the context of X−rays generated from an X−ray tube ? September 15, 2021 Category: Chapter 18 - Atoms and Nuclei , JEE Mains Physics 2002-2019 [...]
A radioactive sample S1 having an activity of 5μCi has twice the number of nuclei as another sample S2 which has an activity of 10μCi. The half lives of S1 and S2 can be
15
Sep
A radioactive sample S1 having an activity of 5μCi has twice the number of nuclei as another sample S2 which has an activity of 10μCi. The half lives of S1 and S2 can be A radioactive sample S1 having an activity of 5μCi has twice the number of nuclei as another sample S2 which has [...]
Electrons with de-Broglie wavelength λ fall on the target in an X−ray tube. The cut-off wavelength of the emitted X−rays is
15
Sep
Electrons with de-Broglie wavelength λ fall on the target in an X−ray tube. The cut-off wavelength of the emitted X−rays is Electrons with de-Broglie wavelength λ fall on the target in an X−ray tube. The cut-off wavelength of the emitted X−rays is September 15, 2021 Category: Chapter 18 - Atoms and Nuclei , JEE Mains [...]
Half-life of a radioactive substance A is 4 days. The probability that a nucleus will decay in two half-lives is
15
Sep
Half-life of a radioactive substance A is 4 days. The probability that a nucleus will decay in two half-lives is Half-life of a radioactive substance A is 4 days. The probability that a nucleus will decay in two half-lives is September 15, 2021 Category: Chapter 18 - Atoms and Nuclei , JEE Mains Physics 2002-2019 [...]
The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is
15
Sep
The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum [...]
A beam of electron is used in an YDSE experiment. The slit width is d. When the velocity of electron is increased, then
15
Sep
A beam of electron is used in an YDSE experiment. The slit width is d. When the velocity of electron is increased, then A beam of electron is used in an YDSE experiment. The slit width is d. When the velocity of electron is increased then September 15, 2021 Category: Chapter 18 - Atoms and [...]