When light waves pass from air to glass, two main phenomena are affected: wavelength and velocity. The correct answer is [D] Only wavelength and velocity. The frequency of the light wave, which determines its color, remains constant because it is determined by the source emitting the light. However,Read more
When light waves pass from air to glass, two main phenomena are affected: wavelength and velocity. The correct answer is [D] Only wavelength and velocity. The frequency of the light wave, which determines its color, remains constant because it is determined by the source emitting the light. However, as light enters a medium like glass with a higher refractive index than air, the wavelength of the light wave decreases. This change occurs because the speed of light in glass is slower than in air, causing the wavelength to shorten. Additionally, the velocity of light decreases in glass due to its denser molecular structure compared to air. Option A is incorrect because the shape of the wave front remains unchanged, and only the wavelength and velocity are affected. Option B is incorrect because the frequency remains constant. Option C is incorrect because only the wavelength and velocity change, not the frequency. Therefore, when light passes from air to glass, the phenomena affected are primarily wavelength and velocity (option D).
Among the options provided, blue light has the highest energy. The correct answer is [A] Blue light. Light energy is determined by its wavelength and frequency, with shorter wavelengths corresponding to higher frequencies and higher energy photons. Blue light has a relatively shorter wavelength (aroRead more
Among the options provided, blue light has the highest energy. The correct answer is [A] Blue light. Light energy is determined by its wavelength and frequency, with shorter wavelengths corresponding to higher frequencies and higher energy photons. Blue light has a relatively shorter wavelength (around 450-495 nanometers) compared to green, red, and yellow light. The energy of a photon is directly proportional to its frequency (E = hf, where E is energy, h is Planck’s constant, and f is frequency), meaning higher frequency light like blue light carries more energy per photon. Option B, green light, has a longer wavelength and lower energy compared to blue light. Option C, red light, has an even longer wavelength and lower energy than green light. Option D, yellow light, falls between green and red in wavelength and energy. Therefore, blue light (option A) has the highest energy among the choices provided due to its shorter wavelength and higher frequency compared to the other wavelengths of light listed.
Plants absorb intensely blue and red light wavelengths. The correct answer is [B] Blue and red. Chlorophyll, the primary pigment in plants responsible for photosynthesis, absorbs light most efficiently in the blue (around 450 nm) and red (around 660 nm) regions of the spectrum. These wavelengths corRead more
Plants absorb intensely blue and red light wavelengths. The correct answer is [B] Blue and red. Chlorophyll, the primary pigment in plants responsible for photosynthesis, absorbs light most efficiently in the blue (around 450 nm) and red (around 660 nm) regions of the spectrum. These wavelengths correspond to peaks in the absorption spectrum of chlorophyll, allowing plants to capture and convert light energy into chemical energy through photosynthesis. Option A, violet and orange, and option D, yellow and violet, do not align with the optimal absorption spectra of chlorophyll for photosynthesis. Option C, indigo and yellow, also do not match the wavelengths most effectively absorbed by chlorophyll. Therefore, the wavelengths of blue and red light (option B) are crucial for driving photosynthesis in plants, providing the energy needed for their growth, development, and metabolic processes.
Jena glass is capable of scattering ultraviolet (UV) rays due to additives like cerium oxide incorporated into its composition. The correct answer is [C] Jena glass. These additives absorb and scatter UV radiation effectively, making Jena glass suitable for applications requiring UV protection. ThisRead more
Jena glass is capable of scattering ultraviolet (UV) rays due to additives like cerium oxide incorporated into its composition. The correct answer is [C] Jena glass. These additives absorb and scatter UV radiation effectively, making Jena glass suitable for applications requiring UV protection. This includes optical lenses, scientific instruments, and protective eyewear where shielding against harmful UV rays is essential. Option A, soda glass, does not possess inherent UV scattering properties and is used in everyday glassware. Option B, Pyrex glass, is known for its resistance to thermal shock and is not specifically designed for UV protection. Option D, Crookes glass, is used in scientific instruments and cathode ray tubes but does not inherently scatter UV rays. Therefore, Jena glass (option C) stands out as the type of glass capable of effectively scattering ultraviolet rays due to its composition and additives designed for UV protection and absorption.
Stars twinkle due to atmospheric refraction. The correct answer is [A] Due to refraction. As starlight travels through Earth's atmosphere, it passes through layers of varying temperature and density. These atmospheric layers cause the light to refract, or bend, slightly in different directions. TheRead more
Stars twinkle due to atmospheric refraction. The correct answer is [A] Due to refraction. As starlight travels through Earth’s atmosphere, it passes through layers of varying temperature and density. These atmospheric layers cause the light to refract, or bend, slightly in different directions. The slight bending of light rays results in the apparent twinkling or shimmering of stars when observed from the ground. This effect is more pronounced when stars are near the horizon, where their light passes through a thicker layer of atmosphere. Option B, reflection, does not cause stars to twinkle as stars do not reflect light like surfaces do. Option C, polarization, refers to the orientation of light waves and does not directly cause twinkling. Option D, scattering, refers to the redirection of light rays in different directions due to particles in the atmosphere but is not the primary cause of star twinkling. Therefore, the twinkling of stars is primarily due to atmospheric refraction (option A), which causes the starlight to bend and fluctuate as it passes through varying atmospheric conditions.
When waves of light pass from air to glass, then which phenomena will be affected?
When light waves pass from air to glass, two main phenomena are affected: wavelength and velocity. The correct answer is [D] Only wavelength and velocity. The frequency of the light wave, which determines its color, remains constant because it is determined by the source emitting the light. However,Read more
When light waves pass from air to glass, two main phenomena are affected: wavelength and velocity. The correct answer is [D] Only wavelength and velocity. The frequency of the light wave, which determines its color, remains constant because it is determined by the source emitting the light. However, as light enters a medium like glass with a higher refractive index than air, the wavelength of the light wave decreases. This change occurs because the speed of light in glass is slower than in air, causing the wavelength to shorten. Additionally, the velocity of light decreases in glass due to its denser molecular structure compared to air. Option A is incorrect because the shape of the wave front remains unchanged, and only the wavelength and velocity are affected. Option B is incorrect because the frequency remains constant. Option C is incorrect because only the wavelength and velocity change, not the frequency. Therefore, when light passes from air to glass, the phenomena affected are primarily wavelength and velocity (option D).
See lessWhich of the following has the highest energy?
Among the options provided, blue light has the highest energy. The correct answer is [A] Blue light. Light energy is determined by its wavelength and frequency, with shorter wavelengths corresponding to higher frequencies and higher energy photons. Blue light has a relatively shorter wavelength (aroRead more
Among the options provided, blue light has the highest energy. The correct answer is [A] Blue light. Light energy is determined by its wavelength and frequency, with shorter wavelengths corresponding to higher frequencies and higher energy photons. Blue light has a relatively shorter wavelength (around 450-495 nanometers) compared to green, red, and yellow light. The energy of a photon is directly proportional to its frequency (E = hf, where E is energy, h is Planck’s constant, and f is frequency), meaning higher frequency light like blue light carries more energy per photon. Option B, green light, has a longer wavelength and lower energy compared to blue light. Option C, red light, has an even longer wavelength and lower energy than green light. Option D, yellow light, falls between green and red in wavelength and energy. Therefore, blue light (option A) has the highest energy among the choices provided due to its shorter wavelength and higher frequency compared to the other wavelengths of light listed.
See lessWhich of the following types of light is absorbed intensely by plants?
Plants absorb intensely blue and red light wavelengths. The correct answer is [B] Blue and red. Chlorophyll, the primary pigment in plants responsible for photosynthesis, absorbs light most efficiently in the blue (around 450 nm) and red (around 660 nm) regions of the spectrum. These wavelengths corRead more
Plants absorb intensely blue and red light wavelengths. The correct answer is [B] Blue and red. Chlorophyll, the primary pigment in plants responsible for photosynthesis, absorbs light most efficiently in the blue (around 450 nm) and red (around 660 nm) regions of the spectrum. These wavelengths correspond to peaks in the absorption spectrum of chlorophyll, allowing plants to capture and convert light energy into chemical energy through photosynthesis. Option A, violet and orange, and option D, yellow and violet, do not align with the optimal absorption spectra of chlorophyll for photosynthesis. Option C, indigo and yellow, also do not match the wavelengths most effectively absorbed by chlorophyll. Therefore, the wavelengths of blue and red light (option B) are crucial for driving photosynthesis in plants, providing the energy needed for their growth, development, and metabolic processes.
See lessWhich one of the following types of glasses can scatter ultraviolet rays?
Jena glass is capable of scattering ultraviolet (UV) rays due to additives like cerium oxide incorporated into its composition. The correct answer is [C] Jena glass. These additives absorb and scatter UV radiation effectively, making Jena glass suitable for applications requiring UV protection. ThisRead more
Jena glass is capable of scattering ultraviolet (UV) rays due to additives like cerium oxide incorporated into its composition. The correct answer is [C] Jena glass. These additives absorb and scatter UV radiation effectively, making Jena glass suitable for applications requiring UV protection. This includes optical lenses, scientific instruments, and protective eyewear where shielding against harmful UV rays is essential. Option A, soda glass, does not possess inherent UV scattering properties and is used in everyday glassware. Option B, Pyrex glass, is known for its resistance to thermal shock and is not specifically designed for UV protection. Option D, Crookes glass, is used in scientific instruments and cathode ray tubes but does not inherently scatter UV rays. Therefore, Jena glass (option C) stands out as the type of glass capable of effectively scattering ultraviolet rays due to its composition and additives designed for UV protection and absorption.
See lessStars twinkle
Stars twinkle due to atmospheric refraction. The correct answer is [A] Due to refraction. As starlight travels through Earth's atmosphere, it passes through layers of varying temperature and density. These atmospheric layers cause the light to refract, or bend, slightly in different directions. TheRead more
Stars twinkle due to atmospheric refraction. The correct answer is [A] Due to refraction. As starlight travels through Earth’s atmosphere, it passes through layers of varying temperature and density. These atmospheric layers cause the light to refract, or bend, slightly in different directions. The slight bending of light rays results in the apparent twinkling or shimmering of stars when observed from the ground. This effect is more pronounced when stars are near the horizon, where their light passes through a thicker layer of atmosphere. Option B, reflection, does not cause stars to twinkle as stars do not reflect light like surfaces do. Option C, polarization, refers to the orientation of light waves and does not directly cause twinkling. Option D, scattering, refers to the redirection of light rays in different directions due to particles in the atmosphere but is not the primary cause of star twinkling. Therefore, the twinkling of stars is primarily due to atmospheric refraction (option A), which causes the starlight to bend and fluctuate as it passes through varying atmospheric conditions.
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