Conceptual physics Exam Questions with Answers

Conceptual physics Exam Questions with Answers radio waves - Answer-A surface that is considered rough for infrared waves may be polished for away from normal - Answer-A beam of light emerges from water into air at an angle. The beam is bent the red glass - Answer-The average speed of light is greatest in below the sighted fish - Answer-If you wish to spear a fish with a regular spear, you should compensate for refraction between the air and water and throw your spear separate from one another - Answer-To say that energy levels in an atom are discrete is to say the energy levels are well defined and only a photon of the same or lower energy - Answer-An atom that absorbs a photon of a certain energy can then emit all of these - Answer-Light from a laser is in the ground state - Answer-The fact that the air you breathe doesn't give off much visible light indicates that most of the electrons of its atoms are frequency - Answer-The energy of a photon depends on its the particle nature of light - Answer-The photoelectric effect best demonstrates the number of electrons ejected per second - Answer-When a clean surface of potassium metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following will also increase? red - Answer-An excited atom decays to its ground state and emits a photon of green light. If instead the atom decays to an intermediate state, then the light emitted could be 6 - Answer-A hypothetical atom has four distinct energy states. Assuming all transitions are possible, how many spectral lines can this atom produce? ultraviolet light. - Answer-Fluorescent brighteners (often called 'wave shifters') are added to laundry detergents to increase the amount of blue light emitted by aging, yellowed fabrics. Brighteners obtain the energy they need to emit this additional blue light from: blue light has a higher frequency than red light - Answer-Red light has a longer wavelength than blue light, so you know that, in empty space bulb will emit a redder-than-normal light and will waste more energy producing infrared radiation. - Answer-A very-long-life incandescent light bulb insures that its filament will not sublime quickly by running the filament at a lower temperature than a normal bulb. Because of the low filament temperature energy producing ultraviolet radiation - Answer-the bulb will emit bluer-than-normal light and will waste more normal bulb - Answer-the bulb will save energy by drawing less power from the power line while still producing the same amount of useful light as a than a normal bulb - Answer-the bulb will help save energy by drawing the same amount of power from the power line while producing more useful light Less bright and more red - Answer-During the summer, 'brownouts' (AC line voltage 120V) are experienced in some large cities when the electrical demand exceeds supply. During a brownout, the light emitted from an incandescent lamp would be