Physics

The variation of decay rate of two radioactive samples A and B with time is shown in fig. Which of the following statements are true? The variation of decay rate of two radioactive samples A and B with time is shown in fig. Which of the following statements are true? June 9, 2021 Category: Chapter [...]

When a nucleus in an atom undergoes a radioactive decay, the electronic energy levels of the atom the electronic energy levels of the atom When a nucleus in an atom undergoes a radioactive decay June 9, 2021 Category: Chapter 13 - Nuclei , NCERT Exemplar Class 12 , Physics ,

The gravitational force between a H-atom and another particle of mass m will be given by Newton’s law: F=GMm/r^2, where r is in km and The gravitational force between a H-atom and another particle of mass m will be given by Newton's law: F=GMm/r^2 where r is in km and June 9, 2021 Category: Chapter [...]

Suppose we consider a large number of containing each containing initially 10000 atoms of a radioactive material with a half life of 1 year. After 1 year. Suppose we consider a large number of containing each containing initially 10000 atoms of a radioactive material with a half life of 1 year. After 1 year. June [...]

Assuming an electron is confined to a 1nm wide region, find the wavelength in momentum using Heisenberg Uncertainty principal (ΔxΔp≈h). You can assume the uncertainty in position Δx and 1nm. Assuming p≅Δp, find the energy of the electron in electron volts. Assuming an electron is confined to a 1nm wide region find the energy of [...]

Consider a metal exposed to light of wavelength 600 nm. The maximum energy of the electrons doubles when light of wavelength 400 nm is used. Find the work function in eV. Consider a metal exposed to light of wavelength 600 nm. The maximum energy of the electrons doubles when light of wavelength 400 nm is [...]

Two monochromatic beam A and B of equal intensity I, hit a screen. The number of photons hitting the screen by beam A is twice that by beam B. Then what inference can you make about their frequencies? hit a screen. The number of photons hitting the screen by beam A is twice that by [...]

There are two sources of light, each emitting with a power of 100 W. One emits X-rays of wavelength 1nm and the other visible light at 500 nm. Find the ratio of number of photons of X-rays to the photons of visible light of the given wavelength? The wavelength of a photon needed to remove [...]

A particle moves in a closed orbit around the origin, due to a force which is directed towards the origin. The de-Broglie wavelength of the particles varies cyclically between two values λ1,λ2 with λ1>λ2. Which of the following statements are true? A particle moves in a closed orbit around the origin due to a force [...]

A proton and an alpha – particle are accelerated using the same potential difference. How are the de-Broglie wavelengths lamba p and lamba alpha related to each other ? A proton and an alpha - particle are accelerated using the same potential difference. How are the de-Broglie wavelengths lamba p and lamba alpha related to [...]