[Solved] Which Color Has The Longest Wavelength
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Download Solution PDFWhich color has the longest wavelength- Orange
- Violet
- Green
- Red
Answer (Detailed Solution Below)
Option 4 : Red Crack with India's Super Teachers FREE Demo Classes Available* Explore Supercoaching For FREE
Free Tests View all Free tests > Free Agniveer Navy MR: 22 May 2025 Shift 1 Memory-Based Paper 8.7 K Users 50 Questions 50 Marks 30 Mins Start Now Detailed Solution
Download Solution PDFThe visible color from shortest to longest wavelength are : Violet , Blue, Green , yellow, orange and red
Red has the lowest frequency and has the longest wavelength. This is the reason why Red color light is used on top of the towers, as it can be easily seen from long distances as compared to other colors.
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Q1.The photoelectric threshold frequency of a metal is \(\gamma\) . When a light of frequency 4\(\gamma\) is incident on the metal, the maximum KE of emitted photoelectron will be Q2.Monochromatic light of frequency 6.0 x 1014 hertz is produced by a laser. If the power emitted is 2.0 x 10-3 watt, then the number of photons emitted per second by the laser is Q3.For photoelectric emission, tungsten requires light of wavelength 2300 Å. If light of 1800 Å wavelength is incident on it, the emission Q4.If the uncertainties in velocities of two particles A and B with mass 1.0 × 10-27 kg and 1.0 × 10-31 kg respectively are same, the ratio of uncertainties in the positions of A and B is: Q5.The electric field of certain radiation is given by the equation E = 200 {sin (4π × 1010)t + sin (4π × 1015)t} falls on a metal surface having work function 2.0 eV. The maximum kinetic energy (in eV) of the photo electrons is (use Planck's constant (h) = 6.63 x 10-34 Js and electron charge (e) = 1.6 × 10-19 C) Q6.What is the reason for boiling of water at lower temperature at high altitudes ? Q7.The wavelength of the radiations for which the energy is maximum in the spectrum is 490 nm. The effective temperature of the sun is Q8.Which of the following options represent the variation of photoelectric current with property of light shown on the x-axis? Q9.When the wavelength of radiation falling on a metal is changed from 500 nm to 200 nm, the maximum kinetic energy of the photoelectrons becomes three times larger. The work function of the metal is close to : Q10.A and B are two metals with threshold frequencies 1.8 × 1014 Hz and 2.2 × 1014 Hz. Two identical photons of energy 0.825 eV each are incident on them. Then photoelectrons are emitted in (Take h = 6.6 × 10−34 Js)More Dual Nature: Photon and Matter Waves Questions
Q1.An electron and proton possess same KE. Their de Broglie wavelength will be Q2.The photoelectric threshold frequency of a metal is \(\gamma\) . When a light of frequency 4\(\gamma\) is incident on the metal, the maximum KE of emitted photoelectron will be Q3.Monochromatic light of frequency 6.0 x 1014 hertz is produced by a laser. If the power emitted is 2.0 x 10-3 watt, then the number of photons emitted per second by the laser is Q4.The wavelength of photon of energy 1 keV is 1.24 x 10- 9. The frequency of 1 MeV photon would be Q5.For photoelectric emission, tungsten requires light of wavelength 2300 Å. If light of 1800 Å wavelength is incident on it, the emission Q6.If the uncertainties in velocities of two particles A and B with mass 1.0 × 10-27 kg and 1.0 × 10-31 kg respectively are same, the ratio of uncertainties in the positions of A and B is: Q7.Consider a beam of electrons (each electron with energy E0) incident on a metal surface kept in an evacuated chamber. Then Q8.Which one of the following radiations has longer wavelength ? Q9.Riya and Arjun were performing an experiment on the photoelectric effect using different metals as photo-cathodes. Riya observed that when she used sodium, electrons were emitted only when the metal was exposed to ultraviolet light. Arjun observed that when he used cesium, electrons were emitted even when the metal was exposed to visible light of relatively low energy. This means that the work functions of the metals used by Riya and Arjun are, respectively — Q10.The electric field of certain radiation is given by the equation E = 200 {sin (4π × 1010)t + sin (4π × 1015)t} falls on a metal surface having work function 2.0 eV. The maximum kinetic energy (in eV) of the photo electrons is (use Planck's constant (h) = 6.63 x 10-34 Js and electron charge (e) = 1.6 × 10-19 C) Suggested Test Series View All > General Knowledge for All Defence Exams 317 Total Tests with
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Q1.The electric field E is measured at the point P(0, 0, d) for different charge configurations. The dependence of E on distance d varies with the nature of the charge distribution. Match the relations given in Column I with the corresponding charge distributions in Column II. Column I (Dependence of E on d) Column II (Charge Distribution) (P) E is independent of d (1) Point charge q placed at the origin (Q) E ∝ 1/d (2) Electric dipole with charges +q at (0,0,l) and −q at (0,0,−l), where 2l ≪ d (R) E ∝ 1/d2 (3) Infinite straight line charge along the x-axis with linear charge density λ (S) E ∝ 1/d3 (4) Two infinite parallel line charges along the x-axis at z = ±l carrying +λ and −λ respectively, with 2l ≪ d (5) Infinite plane sheet of charge lying in the x–y plane with uniform surface charge density σ Q2.Column I shows four different cases of the standard Young’s double-slit experiment, with the screen placed far away from the two slits S1 and S2. In all cases, the following conditions hold: ⇒ S1P0 = S2P0 ⇒ S1P1 − S2P1 = λ/4 ⇒ S1P2 − S2P2 = λ/3 where λ is the wavelength of the light used. In cases B, C, and D, a transparent sheet of refractive index μ and thickness t is placed in front of slit S2. The thickness of the sheet is different in each of these cases. Let δ(P) denote the phase difference between the light waves reaching a point P on the screen from the two slits, and let I(P) denote the intensity at that point. Match each situation given in Column I with the correct statement(s) in Column II. Column I Column II (A) (p) δ(P0) = 0 (B) (q) δ(P1) = 0 (C) (r) I(P1) = 0 (D) (s) I(P0) > I(P1) (t) I(P2) > I(P Q3.An alternating voltage source is applied to different electrical loads. The instantaneous voltage of the source is given by V(t) = V0 sin(ωt + φ0). Each load responds with a current of the form: i(t) = I0 sin(ωt + φ0 + φ) where I0 depends on the impedance magnitude Z, φ is the phase difference between current and voltage, ω is the angular frequency of the source Match each load in List–I with the correct current expression in List–II. List–I and List–II List–I (Load) List–II (Current response) A. Pure resistor R 1. i(t) = (V0/R) sin(ωt + φ0) B. Pure inductor L 2. i(t) = (V0 / (ωL)) sin(ωt + φ0 − 90°) C. Pure capacitor C 3. i(t) = (V0 ωC) sin(ωt + φ0 + 90°) D. Series RL circuit 4. i(t) = (V0 / √(R² Q4.A long stretched string lies along the positive x-axis and consists of three consecutive segments joined smoothly end to end. Segment I (x < 0) has linear mass density μ₁. Segment II (0 < x < L) has linear mass density μ₂. Segment III (x > L) has linear mass density μ₃. All three segments are under the same constant tension T. The string is perfectly flexible, continuous at the junctions, and energy losses are negligible. A harmonic transverse wave is generated in Segment I and travels towards the right. The incident wave in Segment I is given by y = A sin(ωt − k₁x) where ω is fixed by the source and k₁ is the wave number in Segment I. The wave undergoes reflection and transmission at x = 0, and the transmitted wave in Segment II undergoes further reflection and transmission at x = L. (Assume μ₂ is greater than μ₁, μ₃ is less than μ₂ & No energy loss occurs at any junction) Which of the following s Q5.A thin conducting rectangular loop of mass m and resistance R is placed on a smooth horizontal table. The loop can slide without friction along the x-axis. A uniform magnetic field of magnitude B, directed vertically upward, exists only in the region 0 < x < L. Outside this region, the magnetic field is zero. Initially, the loop is entirely outside the magnetic field region and is given a horizontal velocity v0 towards the right. The plane of the loop remains perpendicular to the magnetic field at all times. The length of the loop along the direction of motion is less than L.As the loop moves, parts of it may enter or leave the magnetic field region, inducing currents and magnetic forces. Consider the motion of the loop from the instant it starts entering the magnetic field until it completely exits the field. Which of the following statements are correct? Q6.The potential difference between two points A and B is 6 V. The amount of work done in moving a charge of 3.0 coulombs from A to B is Q7.Two convex lens each of focal length f1 and f2 are placed at a distance 'd'. The chromatic aberration and spherical aberration is minimum. The ratio \(\rm \frac{f_{1}}{f_{2}}\) is: Q8.A hero of a stunt film fires 50g bullets from a machine gun, each at Speed of 1.0 km/s. If he fires 20 bullets in 4 seconds, then he exerts an average force against the machine gun during this period of : Q9.The temperature of a gas is increased by 15°C The corresponding change on Kelvin scale will Q10.A clear sheet of polaroid is placed on the top of a similar sheet so that their polarizing axes make an angle of 30° with each other. The ratio of the intensity of emerging light to incident unpolarised light is : Important Exams- SSC CGL SSC CHSL SSC JE SSC CPO
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