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Radioactive substance do not emit [CPMT 1997; AIEEE 2003]
In a radioactive substance at t=0, the number of atoms is 8×10^{4}. Its half life period is 3 years. The number of atoms 1×10^{4} will remain after interval [MP PMT/PET 1988]
The halflife period of radium is 1600 years. The fraction of a sample of radium that would remain after 6400 years is [NCERT 1980; SCRA 1994; JIPMER 1997 CBSE PMT 1994; MNR 1998; MP PMT 2004; DPMT 2004]
During a negative beta decay [IIT 1987; MNR 1990]
Negative β−decay is expressed by the equation n=p^{+}+e^{}+ν^{}
Which can pass through 20 cm thickness of the steel [MNR 1985; CPMT 1990; RPET 2000]
γrays are highly penetrating.
The halflife period of radium is 1600 years. Its average life time will be [MP PET/PMT 1988]
What percentage of original radioactive atoms is left after five half lives [AFMC 1996; RPMT 1996]
Beta rays emitted by a radioactive material are [IIT 1983; ISM Dhanbad 1994; AFMC 1997; BHU 2000; AIEEE 2002]
Alpha rays emitted from a radioactive substance are [CBSE PMT 1999; RPET 2000]
n the given reaction X_{z}^{A}→ Y^{A}_{Z+1 }→ K_{Z1}^{A4}→ ^{*}K_{Z1}^{A4} Radioactive radiations are emitted in the sequence [AIIMS 1982; CBSE PMT 1993; AFMC 1999; MP PET 2002]
Halflife of Bi^{210} is 5 days. If we start with 50,000 atoms of this isotope, the number of atoms left over after 10 days is [MP PET 1993]
Radioactivity was discovered by
The radioactivity of a certain radioactive element drops to 1/64 of its initial value in 30 seconds. Its halflife is [CPMT 1990, 97]
Which of the following is in the increasing order for penetrating power [IIT 1994; RPET 2003]
The halflife of a radioactive element which has only 1/32 of its original mass left after a lapse of 60 days is [MP PET 1992; DPMT 2002]
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