SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

Using a nuclear counter the count rate of emitted particles from a radioactive source is measured. At t=0 it was 1600 counts per second and t=8 seconds it was 100 counts per second. The count rate observed, as counts per second, at t=6 seconds is close to :

(a)

150

(b)

360

(c)

200

(d)

400


Question ID - 50227 :-

Using a nuclear counter the count rate of emitted particles from a radioactive source is measured. At t=0 it was 1600 counts per second and t=8 seconds it was 100 counts per second. The count rate observed, as counts per second, at t=6 seconds is close to :

(a)

150

(b)

360

(c)

200

(d)

400

1 Answer
5876 Votes
3537

Answer Key : (c) -

at t=0, = =1600C/s

at t=8s, A=100C/s

=  in 8 sec

Therefore half-life is =2 sec

 Activity at t = 6 will be 1600

                           = 200C/s

 correct answer is (c).



Next Question :

If the magnetic field of a plane electromagnetic wave is given by (The speed of light =3× /m/s) B=100×  then the maximum electric field associated with it is

(a)

4 ×  N/C

(b)

4.5 ×  N/C

(c)

6 ×  N/C

(d)

3 ×  N/C


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