The relative biological effectiveness of a particular radon decay is 10 due to alpha particles. if the absorbed dose of a person in a basement was 3.8 msv/y, what is the radiation dose in gy/y and the absorbed dose in rem/y?

Explanation:

radiation dose =10 (absorbed dose).

= 10×3.8 mSv/y× 1Gy/1000mSv

= 0.038 Gy/y

Now calculating the absorbed dose in rem/y  as follows

absorbed dose  =3.8mSv/y×1 rem/10 mSv

=0.38 rem/y

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.