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A metallic surface ejects electrons when exposed to green light of intensity I but not when exposed to yellow light of intensity I. It is possible to eject electrons from the same surface by (i) yellow light of some intensity which is more than I (ii) green light of any intensity (iii) red light of any intensity (iv) violet light of any intensity
17
Jun
A metallic surface ejects electrons when exposed to green light of intensity I but not when exposed to yellow light of intensity I. It is possible to eject electrons from the same surface by (i) yellow light of some intensity which is more than I (ii) green light of any intensity (iii) red light of [...]
Let `(nr) and (nb) be respectively the number of photons emitted by a red bulb and a blue blub of equal power in a given time.
17
Jun
Let `(nr) and (nb) be respectively the number of photons emitted by a red bulb and a blue blub of equal power in a given time. Let `(nr) and (nb) be respectively the number of photons emitted by a red bulb and a blue blub of equal power in a given time. June 17, 2021 [...]
A hydrogen atom moving at a speed v absorbs a photon of wavelength 122 nm and stops. The value of v is (mass of hydrogen atom =1.67×10^−27 kg)
17
Jun
A hydrogen atom moving at a speed v absorbs a photon of wavelength 122 nm and stops. The value of v is (mass of hydrogen atom =1.67×10^−27 kg) A hydrogen atom moving at a speed v absorbs a photon of wavelength 122 nm and stops. The value of v is (mass of hydrogen atom =1.67×10^−27 [...]
The energy of a photon in eV of wavelength lamba nm will be
17
Jun
The energy of a photon in eV of wavelength lamba nm will be The energy of a photon in eV of wavelength lamba nm will be June 17, 2021 Category: Cengage NEET by C.P Singh , Chapter 11 - Photoelectric Effect , Part 2 ,
Let p and E denote the linear momentum and energy of a photon. If the wavelength is decreased,
17
Jun
Let p and E denote the linear momentum and energy of a photon. If the wavelength is decreased, Let p and E denote the linear momentum and energy of a photon. If the wavelength is decreased June 17, 2021 Category: Cengage NEET by C.P Singh , Chapter 11 - Photoelectric Effect , Part 2 ,
If 5% of the energy supplied to a bulb is irradiated as visible light, how many quanta are emitted per second by a 100 W lamp? Assume wavelength of visible light as 5.6×10^−5 cm.
17
Jun
If 5% of the energy supplied to a bulb is irradiated as visible light, how many quanta are emitted per second by a 100 W lamp? Assume wavelength of visible light as 5.6×10^−5 cm. how many quanta are emitted per second by a 100 W lamp? Assume wavelength of visible light as 5.6×10^−5 cm. If [...]
The half life of a radioactive substance is 20 minutes . The approximate time interval (t2−t1) between the time t2 when 2/3 of it had decayed and time t1 when 1/3 of it had decay is
17
Jun
The half life of a radioactive substance is 20 minutes . The approximate time interval (t2−t1) between the time t2 when 2/3 of it had decayed and time t1 when 1/3 of it had decay is The half life of a radioactive substance is 20 minutes . The approximate time interval (t2−t1) between the time [...]
The half-life period of a radioactive element x is same as the mean life time of another radioactive element y. Initially, both of them have the same number of atoms. Then, (a) x and y have the same decay rate initially (b) x and y decay at the same rate always (c) y will decay at a faster rate than x (d) x will decay at a faster rate than y
17
Jun
The half-life period of a radioactive element x is same as the mean life time of another radioactive element y. Initially, both of them have the same number of atoms. Then, (a) x and y have the same decay rate initially (b) x and y decay at the same rate always (c) y will decay [...]
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(a) x and y have the same decay rate initially (b) x and y decay at the same rate always (c) y will decay at a faster rate than x (d) x will decay at a faster rate than y ,
both of them have the same number of atoms. Then ,
The half-life period of a radioactive element x is same as the mean life time of another radioactive element y. Initially ,
A radioactive sample has half-life of 5 years. Probability of decay in 10 years will be.
17
Jun
A radioactive sample has half-life of 5 years. Probability of decay in 10 years will be. A radioactive sample has half-life of 5 years. Probability of decay in 10 years will be. June 17, 2021 Category: Cengage NEET by C.P Singh , Chapter 14 - Nuclear Physics and Radioactivity , Part 2 ,
The count rate from 100cm^3 of a radioactive liquid is c. Some of this liquid is now discarded. The count rate of the remaining liquid is found to be c/10 after three half-lives. The volume of the remaining liquid, in cm^3, is
17
Jun
The count rate from 100cm^3 of a radioactive liquid is c. Some of this liquid is now discarded. The count rate of the remaining liquid is found to be c/10 after three half-lives. The volume of the remaining liquid, in cm^3, is 90% of the active nuclei present in a radioactive sample are found to [...]