Physical World
Which statement is incorrect?
Radioactive substances emit $$\gamma$$ -rays which are:
Gamma rays are high - energy photons of light, which have zero electric charges.
Hence, option $$D$$ is correct.
Which statement is incorrect?
The velocity of $$\alpha$$ -rays is approximately:
Alpha rays consist of a stream of:
Which is the correct statement?
$$\alpha$$ -rays have:
Of the following radiations, the one most easily stopped by air is:
Which has the least penetrating power?
The charge exists on $$\gamma$$ -rays:
Which of the following can be used to convert $$_7^{14}N$$ and $$_8^{17}O$$?
The charge on gamma rays is: