Download App

MODEL PAPER 9 — Physics STD 12 Science — Question

Gujarat 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→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

An $\alpha$–particle and a proton are moving in the plane of paper in a region where there is a uniform magnetic field directed normal to the plane of the paper. If the particles have equal linear momenta, what would be the ratio of the radii of their trajectories in the field?
→
While gas from a cooking gas cylinder is used, the pressure does not fall appreciably till the last few minutes. Why?
→
A charged 30μF capacitor is connected to a 27mH inductor. What is the angular frequency of free oscillations of the circuit?
→
A wire of copper whose radius is 0.1 mm and resistance are $2 k \Omega$. It is joined with a supply of 40 V . Find: (i) how many electrons are transferred per second between one end of the wire and the supply? (ii) what will be current density of the wire?
→
A soap film of thickness 0.0011mm appears dark when seen by the reflected light of wavelength 580nm. What is the index of refraction of the soap solution, if it is known to be between 1.2 and 1.5?
→
Using Rutherford model of the atom, derive the expression for the total energy of the electron in hydrogen atom. What is the significance of total negative energy possessed by the electron?
→
A cell of emf ‘E’ and internal resistance ‘r’ is connected across a variable resistor ‘R’. Plot a graph showing variation of terminal voltage ‘V’ of the cell versus the current ‘I’. Using the plot, show how the emf of the cell and its internal resistance can be determined.
→
Give an example for which $\overrightarrow{\text{A}}.\overrightarrow{\text{B}}=\overrightarrow{\text{C}}.\overrightarrow{\text{B}}$ but $\overrightarrow{\text{A}}\neq\overrightarrow{\text{C}}.$
→
(a) Calculate the potential at a point $P$ located at a distance of 9 cm due to the charge $4 \times 10^{-7} C$.(b) Now, find the work done in bringing the charge $2 \times 10^{-9} C$ from infinity to point P . Does the answer depend on the path along which the charge is brought?
→
The mean speed of the molecules of a hydrogen sample equals the mean speed of the molecules of a helium sample. Calculate the ratio of the temperature of the hydrogen sample to the temperature of the helium sample.
→