Download App

MODEL PAPER 9 — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsMODEL PAPER 92 Marks
Question
Which of the following electromagnetic waves has (a) minimum wavelength, and (b) minimum frequency? Write one use of each of these two waves.
Infrared waves, Microwaves, $\gamma$-rays and X-rays
✓

Answer

The minimum wavelength or Maximum frequency has maximum energy and vice versa, $\gamma$ - Ray has maximum energy so it has a minimum wavelength and Microwaves have minimum energy so it has a maximum frequency.
Use of electromagnetic waves: 
Infrared waves: Heat-sensitive thermal imaging cameras, Remote controls. 
Microwaves: microwave radio relay networks, radar, satellite, and spacecraft communication. 
$\gamma$-rays: Used as tracers in medicine, Astronomy.
X-rays: checking fracture

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from MODEL PAPER 9→MODEL PAPER 9 — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

Find the area bounded under the curve $y = 3x^2 + 6x + 7$ and the $X-$ axis with the ordinates at $x = 5$ and $x = 10.$
→
Find the average frictional force needed to stop a car weighing 500kg in a distance of 25m if the initial speed is 72km/ h.
→
White light is used in a Young's double slit experiment. Find the minimum order of the violet fringe $(\lambda=400\ \text{nm}),$ which overlaps with a red fringe $(\lambda=700\ \text{nm}).$
→
  1. An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?
  2. Explain why two field lines never cross each other at any point?
→
Is it necessary to have two waves of equal intensity to study interference pattern? Will there be an effect on clarity if the waves have unequal intensity?
→
Find the angular separation between the consecutive bright fringes in a Young's double slit experiment with blue$-$green light of wavelength $500\ nm$. The separation between the slits is $2.0 \times 10^{-3}m.$
→
If the solenoid in Exercise $5.5$ is free to turn about the vertical direction and a uniform horizontal magnetic field of $0.25 T$ is applied, what is the magnitude of torque on the solenoid when its axis makes an angle of $30^\circ$ with the direction of applied field?
→
Answer the following questions:
In any ac circuit, is the applied instantaneous voltage equal to the algebraic sum of the instantaneous voltages across the series elements of the circuit? Is the same true for rms voltage?
→
The lower end of a capillary tube is immersed in mercury. The level of mercury in the tube is found to be $2\ cm$ below the outer level. If the same tube is immersed in water, upto what height will the water rise in the capillary?
→
How magnetic field lines are drawn? Write their four characteristics.
→