Recently Active Modern Physics Questions

If the atom Fm257100 follows the Bohr Model & the radius of Fm257100 is n times the Bohr radius , then find n : (A) 100 (B) 200 (C) 4 (D) 1/4 ...

A nucleus with mass number 220 initially at rest emits an α-particle . If the Q value of the reaction is 5.5 MeV , Calculate Kinetic Energy of the α - particle (A) 4.4 MeV (B) 5.4 MeV (C) 5.6 MeV (D) 6.5 MeV ...

a point source of constant power is brought from infinity 2wards adisc along its axis.P is apoint on the axis.Radiation pressure at P 1st increases den decreases.Why? ...

The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to I/8. The thickness of lead which will reduce the intensity to I/2 will be ? ...

Half lives of two uranium samples U238 and U235 are known to be 4.5 *10^9 and 7.1*10^8 yr ,respectively .if the earth was formed with equal amts of the two isotopes estimate the current age of the earth given that uranium ore ...

there are 2radioactive substances who emit 2 and beta emissions there disintegration constant are in the ration 2 is to 3 fto hv equal probabilities of getting 2 and b particles the ration of the number of nuclei f a to the n ...

The mass per nucleon in H atom is same as in an oxygen atom ...

this particle mass m moves in a box forth and back with speed v.Considering matter wave associated with particle and knowing that due to back and forth motion standing waves will be produced in box,find a)min.energy to excite ...

Using Bohr's theory and DeBroglie eqn... Find value of n as used in mvr=nh/2Ï€ *Image* ...

A sample of 210 A which is emitter with T1/2 = 138 days is observed by a student to have 2000 disintegrations per second. The mass of 210A sample is 1.) 1.0 × 10-11 kg 2. ) 1.7 × 10-11 kg 3). 1.7 × 10-11 gm 4.) 1.2 × 10-1 ...

Can anyone tell me how we write q-value in case of β- and β+ decay? I have some confusion in what is written in hcverma. ...

can ne1 plz tell me wazz relativistic momentum n wazz relativistic relason bet kinetic energy and linear momentum ...

A spectroscopic instrument can resolve 2 nearly wavelengths λ & λ+δλ if λ/δλ < 8000. how many lines will be resolved by the instrument? ...

what are fermions ??????????????????give examples ...

how photon has linear momentum as it has zero rest mass ????? ...

why nuclear force is not conservative ????????? ...

i'm a IX student of an ICSE affiliated skool. Nd 2day while teaching the Atomic structure, my teacher said about some isoelectronic species. I didn't get that. will anyone explain me it in way i can understand?? ...

why ordinary light is incoherent? ...

WARNING : NOT FOR JEE ASPIRANTS as of now I was reading about special relativity and got some doubts I wud be glad for someone to clear these DOUBT 1 : TIME DILATION it is derived t = t' / 1 - (v/c)2 taking a ray of light mov ...