✕
  1. Tardigrade
  2. Question
  3. Physics
  4. Two radioactive elements X and Y have half-life times of 50 minutes and 100 minutes, respectively. Samples X and Y initially contain equal numbers of atoms. After 200 minutes, the ratio ( text number of undecayed atoms of X/ text number of undecayed atoms of Y) is.

Q. Two radioactive elements and have half-life times of minutes and minutes, respectively. Samples and initially contain equal numbers of atoms. After minutes, the ratio
is.

Nuclei Report Error

Solution:

After minutes the number of will reduce to and that of will reduce to .

Questions from Nuclei

1. A sample of as iodine ion was administered to a patient in a carrier consisting of of stable iodine ion. After days of initial radioactivity was detected in the thyroid gland of the patient. The percentage of stable iodine ion that had migrated to the thyroid gland, if for iodide ion is days is

NTA Abhyas 2020

2. A radioactive sample at any instant has its disintegration rate . After , the rate is . Then, the decay constant (per minute) is

NTA Abhyas 2020

3. A proton is bombarded on a stationary lithium nucleus. As a result of the collision two -particles are produced. If the direction of motion of the -particles with the initial direction of motion makes an angle , then the kinetic energy of the striking proton is [Given, binding energies per nucleon of and , ]

NTA Abhyas 2020

4. Given the masses of various atomic particles , , , where proton, neutron, electron, antineutrino and deuteron. Which of the following process is allowed by momentum and energy conservation ?

JEE Main 2020

5. Find the binding energy per nucleon for . Mass of proton mass of neutron and mass of tin nucleus (take

JEE Main 2020

Physics Most Viewed Questions

1. If and respectively denote energy and gravitational constant, then has the dimensions of:

NEET 2021 Physical World, Units and Measurements

2. The de Broglie wavelength of an electron moving with kinetic energy of is nearly

NEET 2020 Dual Nature of Radiation and Matter

3. A car starts from rest and accelerates at At , a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at ? (Take

NEET 2021 Motion in a Straight Line

4. A wheel with metallic spokes each long is rotated with a speed of in a plane perpendicular to a magnetic field of . The induced emf between the axle and rim of the wheel will be,

NEET 2020 Electromagnetic Induction

5. A barometer is constructed using a liquid (density What would be the height of the liquid column, when a mercury barometer reads ?
(density of mercury

NEET 2020 Mechanical Properties of Fluids

Latest Updates