Characteristic Spectrum

Q. The $K_{\alpha }$ x-ray emission line of tungsten occurs at $\lambda$ = 21 pm. What is the energy difference between $E_K$ and $E_L$ levels in this atom (MeV refers to mega electron volts;1MeV = ${10}^6$ eV and hc = 1242 eVnm)?

1. 0.59 MeV
2. 1.2 MeV
3. 59 KeV
4. 13.6 eV

Q.

For a given material, the energy and wavelength of characteristic x-rays satisfy:

1. $E\left(K_{\alpha }\right)$ > $E\left(K_{\beta }\right)$ > $E\left(K_{\gamma }\right)$
2. $E\left(M_{\alpha }\right)$ > $E\left(L_{\alpha }\right)$ > $E\left(K_{\alpha }\right)$
3. $\lambda \left(K_{\alpha }\right)$ > $\lambda \left(K_{\beta }\right)$ > $\lambda \left(K_{\gamma }\right)$
4. $\lambda \left(M_{\alpha }\right)$ > $\lambda \left(L_{\alpha }\right)$ > $\lambda \left(K_{\alpha }\right)$

Q.

The Ka X-ray emission line of tungsten occurs at I = 0.021 nm. The energy difference between K and L levels in this atoms is about: (IIT JEE 1997)

1. 0.51 MeV

2. 1.2 MeV

3. 59 keV

4. 13.6 eV

Q.

Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube. K-shell electrons of tungsten have 72.5 keV energy. X-rays emitted by the tube contain only: (IIT JEE 2000)

1. a continuous X-ray spectrum (|Bremsstrahlung) with minimum wavelength of $\approx$ 0.155 Å

2. a continuous X-ray spectrum (Bremsstrahlung) with all wavelengths

3. the characteristic X-ray spectrum of tungsten

4. a continuous X-ray spectrum (Bremsstrahlung) with minimum wavelength of $\approx$ 0.155 Å and the characteristic X-ray spectrum of tungsten.

Q.
$X-K_{\alpha }$
$Y-K_{\beta }$
$Z-K_{\gamma }$

1. 1-x, 2-y, 3-z
2. 2-x, 1-y, 3-z
3. 3-x. 2-y, 1-z
4. 1-x, 3-y, 2-z

Q.

The wavelength of L-alpha characteristic X-Ray is :

1. Directly proportional to Ek-El

2. Inversely proportional to El-Em

3. Directly proportional to El-Ek

4. Directly proportional to El-Em

Q. Two ${}_{29}C{u}^{64}$ nuclei almost touch each other. The electronics repulsive energy of the system will be $(R_0=1\text{fm})$

1. $7.88\text{MeV}$
2. $0.788\text{MeV}$
3. $788\text{MeV}$
4. $126.15\text{MeV}$