Question

Activity 26-1. Photons 1 [Accompanies Section 26-2] Two light bulbs are placed side by side. The first light bulb emits red light of wavelength 700 nm, and the second light bulb emits violet light of wavelength 400 nm. (a) Fill in the blanks in þach of the following statements with the word greater, the word smaller, the phrase the same, or the phrase don't know. (i) Compared to the photons of red light, the photons of violet light have frequency. (ii) Compared to the photons of red light, the photons of violet light have energy per photon. (iii) Compared to the speed in a vacuum of the photons of red light, the speed in a vacuum of the photons of violet light is (iv) The light bulbs are used to illuminate two different substances, 1 and 2. For substance 1, either red light or violet light will cause electrons to be ejected from the substance. For substance 2, violet light will cause electrons to be ejected from the substance, but red light will not. Compared to the work function of substance 1, the work function of substance 2 is (b) Your eye receives light of the same intensity from both the red light bulb and the violet light bulb. Which of the following statements is correct? Explain your reasoning. (i) Your eye receives the same number of photons per second from both bulbs. (ii) Your eye receives more photons per second from the red bulb. (iii) Your eye receives more photons per second from the violet bulb. (iv) Two of the above are possible. (v) All of (i), (ii), and (iii) are possible.

Activity 26-1. Photons I [Accompanies Section 26-2] Two light bulbs are placed side by side. The first light bulb emits red light of wavelength 700 nm, and the second light bulb emits violet light of wavelength 400 nm. (a) Fill in the blanks in each of the following statements with the word greater, the word smaller, the phrase the same, or the phrase don’t know. (i) Compared to the photons of red light, the photons of violet light have __________ frequency. (ii) Compared to the photons of red light, the photons of violet light have __________ energy per photon. (iii) Compared to the speed in a vacuum of the photons of red light, the speed in a vacuum of the photons of violet light is __________. (iv) The light bulbs are used to illuminate two different substances, 1 and 2. For substance 1, either red light or violet light will cause electrons to be ejected from the substance. For substance 2, violet light will cause electrons to be ejected from the substance, but red light will not. Compared to the work function of substance 1, the work function of substance 2 is __________. (b) Your eye receives light of the same intensity from both the red light bulb and the violet light bulb. Which of the following statements is correct? Explain your reasoning. (i) Your eye receives the same number of photons per second from both bulbs. (ii) Your eye receives more photons per second from the red bulb. (iii) Your eye receives more photons per second from the violet bulb. (iv) Two of the above are possible. (v) All of (i), (ii), and (iii) are possible.

Answer 1

Solution in the uploaded images

Solution. - Toon (and) l A. Yoonm (tu (violet) we know, I=8 speed of light is same for read & violead light 4.29x1014 the Tooxlor? 7.5x1014 H₂ 400 xlo e is greater than vi violet light has greater frequency than red. 3x108 hr. 6₂ = hoz Since ₂ > 8, Energy of violet phaton light photon is quater than red ") Speed of sud light and violet light photon will be same in vaccuum is able since in substance (2) only violet light to eject the electron, From equation E = Wat kis since Ex>6, Mare energy is required to eject election from substance (2). of substance 2 is greater than 1 work suretion

Intensity of lights Power tua Breugy time Area =nho Axt I= nihri At 1 I2 = nahrz Since the Therefore fons, For II = IL Klee nahk non, as per second is more than no. of phations of rad lighte violet bulb, option (11) is correct Hit like if you understood the solution!!