Alpha Decay

Q. $A_Z^M\to B_{Z-1}^{M-12}$
The number of $\alpha$ and $\beta$ particles emitted in the above conversion is

1. $3\alpha ,5\beta$
2. $5\alpha ,6\beta$
3. $\alpha ,3\beta$
4. $2\alpha ,4\beta$

Q. $\alpha$- particles can be detected using

1. Zinc sulphide screen
2. Barium sulphate
3. Thin aluminum sheet

4. Gold foil

Q. The element Lawrencium ${(}_{103}^{256}Lr)$ is named after Ernest Lawrence, whose invention - the cyclotron - helped discover many radioactive nuclei. Consider now, the alpha decay of ${}_{103}^{256}Lr$.
${}_{103}^{256}Lr{\to }_b^{a}Md+\alpha$
Where $\alpha$ represents the alpha particle given out. What are the values of a and b?

1. a=252 ; b =105
2. a=260 ; b =101
3. a=260 ; b =105
4. a=252 ; b =101

Q. What will be the daughter nuclei after 4 alpha decays of ${}_{91}^{231}Pa$

1. ${}_{89}^{227}X$
2. ${}_{83}^{215}X$
3. ${}_{75}^{215}X$
4. None of these

Q.

$T{h}^{234}$ disintegrates and emits 6β- and 7α-particles to form a stable element. Find the atomic number and mass number of the stable product. Also identify the element.
(IIT-JEE, 2004)

1. ${}_{82}P{b}^{206}.$
2. ${}_{80}P{b}^{204}.$
3. ${}_{82}P{b}^{204}.$
4. ${}_{80}H{g}^{202}.$

Q. In an alpha decay the mass number of an element decreases by___.

Q.

Calculate the number of α- and β-particles emitted when ${}_{92}{U}^{238}$ changes into radioactive ${}_{82}P{b}^{206}.$
(IIT-JEE, 2000)

1. 3, 4
2. 4, 3
3. 6, 8
4. 8, 6

Q. In an alpha decay the atomic number of an element decreases by ___.

Q.

Calculate the total number of α- and β-particles emitted in the nuclear reaction ${}_{92}{U}^{238}{⟶}_{82}P{b}^{214}.$

(IIT-JEE, 2009)

1. 4
2. 6
3. 8
4. 9

Q.

Thorium with atomic number 92 and mass number 238 disintegrates to give Pb with atomic number 82 and mass number 206. How many alpha and beta particles are emitted during this process?

1. 7 and 8

2. 6 and 7

3. 7 and 6

4. 9 and 6