NEET Physics: Questions 1417 - 1421 of 2099
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Question number: 1417
Question number: 1418
A 5 % change in wavelength of light received from a star, shows that the star is moving with 0.05 c velocity.
The wavelength of emitted light depends upon the velocity of the source.
|a.||Both Ꭺ and Ꭱ are false|
|b.||Ꭺ is true but Ꭱ is false|
|c.||Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ|
|d.||Ꭺ is false but Ꭱ is true|
Question number: 1419
The work function for the surface of aluminum is 4.2 eV. What will be the wavelength of that incident light for which the stopping potential will be 0? (h = 6.6 ×10 -34 J-s, e = 1.6 × 10 -19)
2946 × 10 -7 m
Question number: 1420
A constant volume gas thermometer shows pressure reading of 50 cm and 90 cm of mercury at 0°C and 100°C respectively. When the pressure reading is 60 cm of mercury, the temperature is
Read the passage given below and answer the questions that follow:
In a Young’s double slit experiment a monochromatic light whose wavelength is λ strikes on the slits, separated by distance d, as shown in the figure. Refractive index of the medium between slits and screen varies with time t as . Here n 0 and k are positive constants. Position of any point P on screen is measure by its -coordinate as shown.