1. Gamma rays are electromagnetic radiations of wavelengths of 10-6 to 10-5 cm. (1983)
Ans: False
2. In β-emission from a nuclues the atomic number of the daughter element decreases by one. (JEE 1990).
Answer: False
In β-emission, number of protons in the nucleus goes up by one.
3. In a given electric field, β-particles are deflected more than α-particles having larger charge. (JEE 1993)
True
The deflection of the particle depends on the acceleration produced in it. The acceleration depends on the force and mass. Thus, in case of electric field it depends on the e/m of the particles. For β-particles, e/m is larger than α-particles because electrons are very very light than He+ species. So charge on helium particle is only twice high but mass is very very high.
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