JEE Mains Physics 2002-2019 Solved Video Solutions
A proton is fired from very far away towards a nucleus with charge Q=120 e, where e is the electronic charge. It makes a closest approach of 10fm to the nucleus. The de Broglie wavelength (in units of fm) of the proton at its start is (Take the proton mass, mp=(5/3)×10^−27kg, Js/c, 1/4πε0=9×10^9m/F, 1 fm=10^−15m)
15
Sep
A proton is fired from very far away towards a nucleus with charge Q=120 e, where e is the electronic charge. It makes a closest approach of 10fm to the nucleus. The de Broglie wavelength (in units of fm) of the proton at its start is (Take the proton mass, mp=(5/3)×10^−27kg, Js/c, 1/4πε0=9×10^9m/F, 1 fm=10^−15m) [...]
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1 fm=10^−15m) ,
1/4πε0=9×10^9m/F ,
A proton is fired from very far away towards a nucleus with charge Q=120 e ,
Js/c ,
mp=(5/3)×10^−27kg ,
where e is the electronic charge. It makes a closest approach of 10fm to the nucleus. The de Broglie wavelength (in units of fm) of the proton at its start is (Take the proton mass ,
An α particle and a proton are accelerated from rest by a potential difference of 100 V. After this, their de Broglie wavelengths are λ α and λα respectively. The ratio λ p/λ α to the nearest integer is
15
Sep
An α particle and a proton are accelerated from rest by a potential difference of 100 V. After this, their de Broglie wavelengths are λ α and λα respectively. The ratio λ p/λ α to the nearest integer is An α particle and a proton are accelerated from rest by a potential difference of 100 [...]
A silver sphere of radius 1 cm and work function 4.7 eV is suspended from an insulating thread in free-space. It is under continuous illumination of 200 nm wavelength light. As photoelectrons are emitted, the sphere gets charged and acquires a potential. The maximum number of photoelectrons emitted from the sphere is A×10^z (where 1 smaller then A smaller then 10). The value of Z is
15
Sep
A silver sphere of radius 1 cm and work function 4.7 eV is suspended from an insulating thread in free-space. It is under continuous illumination of 200 nm wavelength light. As photoelectrons are emitted, the sphere gets charged and acquires a potential. The maximum number of photoelectrons emitted from the sphere is A×10^z (where 1 [...]
The ratio of the kinetic energy of the n = 2 electron for the H atom to that of He^+ ion is.
15
Sep
The ratio of the kinetic energy of the n = 2 electron for the H atom to that of He^+ ion is. The ratio of the kinetic energy of the n = 2 electron for the H atom to that of He^+ ion is. September 15, 2021 Category: Chapter 18 - Atoms and Nuclei , [...]
The wavelength of light emitted in the visible region by He^+ ions after collisions with H atoms is:
15
Sep
The wavelength of light emitted in the visible region by He^+ ions after collisions with H atoms is: The wavelength of light emitted in the visible region by He^+ ions after collisions with H atoms is: September 15, 2021 Category: Chapter 18 - Atoms and Nuclei , JEE Mains Physics 2002-2019 Solved Video Solutions ,
For photo-electric effect with incident photon wavelength λ, the stopping potential is V0. Identify the correct variation(s) of V0 with λ and 1/λ.
15
Sep
For photo-electric effect with incident photon wavelength λ, the stopping potential is V0. Identify the correct variation(s) of V0 with λ and 1/λ. For photo-electric effect with incident photon wavelength λ the stopping potential is V0. Identify the correct variation(s) of V0 with λ and 1/λ. September 15, 2021 Category: Chapter 18 - Atoms and [...]
The quantum number n of the state finally populated in He^+ ions is
15
Sep
The quantum number n of the state finally populated in He^+ ions is The quantum number n of the state finally populated in He^+ ions is September 15, 2021 Category: Chapter 18 - Atoms and Nuclei , JEE Mains Physics 2002-2019 Solved Video Solutions ,
In a radioactive decay chain, 23290Th nucleus decays to 21282Pb nucleus. Let Nα and Nβ be the number of α and β- particles, respectively, emitted in this decay process. Which of the following statements is (are) true?
15
Sep
In a radioactive decay chain, 23290Th nucleus decays to 21282Pb nucleus. Let Nα and Nβ be the number of α and β- particles, respectively, emitted in this decay process. Which of the following statements is (are) true? 23290Th nucleus decays to 21282Pb nucleus. Let Nα and Nβ be the number of α and β- particles [...]
The graph between 1/λ and stopping potential (V) of three metals having work functions ∮1,∮2 and ∮3 in an experiment of photoelectric effect is plotted as shown in the figure. Which of the following statement(s) is/are correct ? (Here λ. is the wavelength of the incident ray).
15
Sep
The graph between 1/λ and stopping potential (V) of three metals having work functions ∮1,∮2 and ∮3 in an experiment of photoelectric effect is plotted as shown in the figure. Which of the following statement(s) is/are correct ? (Here λ. is the wavelength of the incident ray). ∮2 and ∮3 in an experiment of photoelectric [...]
An electron in hydrogen atom makes a transition n1→n2 where n1, and n2 are principal quantum numbers of the two states. Assuming Bohr’s model to be valid, the time period of the electron in the initial state is eight times that in the final state. The possible values of n1 and n2 are
15
Sep
An electron in hydrogen atom makes a transition n1→n2 where n1, and n2 are principal quantum numbers of the two states. Assuming Bohr’s model to be valid, the time period of the electron in the initial state is eight times that in the final state. The possible values of n1 and n2 are An electron [...]