MCQ
For harder X-rays:
- AThe wavelength is higher.
- BThe intensity is higher.
- CThe frequency is higher.
- DThe photon energy is higher.
✓
Answer
- The frequency is higher.
- The photon energy is higher.
Explanation:
Harder X-rays are the X-rays having low wavelengths. Since the frequency varies inversely with the wavelength, hard X-rays have high frequency.
Energy of a photon (E) is given by
$\text{E}=\frac{\text{hc}}{\lambda}$
Here,
h = Planck's constant
c = Speed of light
$\lambda$ = Wavelength of light.
Clearly, energy varies inversely with wavelength. Therefore, the energy of the photon will be higher for the hard X-ray.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Which of the following would you prefer to use while reading small letters found in a dictionary?
What is the ratio of the polarization to εo times the electric field called?
The mass of a neutron is:
If the refractive indices of a prism for red, yellow and violet colours be 1.61, 1.63 and 1.65 respectively, then the dispersive power of the prism will be
|
(a) |
(b) |
(c) |
(d) |
Change Q on a capacitor varies with voltage V as shown in the figure, where Q is taken along the X-axis and V along the Y-axis. The area of triangle OAB represents
|
(a) Capacitance |
(b) Capacitive reactance |
|
(c) Magnetic field between the plates |
(d) Energy stored in the capacitor |
100 cells each of e.m.f. 5 V and internal resistance 1 ohm are to be arranged so as to produce maximum current in a 25 ohms resistance. Each row is to contain equal number of cells. The number of rows should be
|
(a) 2 |
(b) 4 |
(c) 5 |
(d) 10 |
A boy stands straight infront of a mirror at a distance of 30 cm away from it. He sees his erect image whose height is 
of his real height. The mirror he is using is
|
(a) Plane mirror |
(b) Convex mirror |
(c) Concave mirror |
(d) Plano-convex mirror |
The following figure shows three situations when an electron with velocity $\vec{v}$ travels through a uniform magnetic field $\vec{B}$. In each case, what is the direction of magnetic force on the electron?
→The refractive indices of glass and water w.r.t. air are 3/2 and 4/3 respectively. The refractive index of glass w.r.t. water will be
|
(a) 8/9 |
(b) 9/8 |
(c) 7/6 |
(d) None of these |
The equation E = pc is valid: