Questions from College Physics

Q: An ordinary drinking glass is filled to the brim with water (

An ordinary drinking glass is filled to the brim with water (268.4 mL) at 2.0°C and placed on the sunny pool deck for a swimmer to enjoy. If the temperature of the water rises to 32.0°C before the swi...

Q: Exposure to ultraviolet light is one method used to sterilize medical equipment

Exposure to ultraviolet light is one method used to sterilize medical equipment, disinfect drinking water, and pasteurize fruit juices. Microorganisms are typically small enough that UV light can pene...

Q: A fluorescent substance absorbs EM radiation of one wavelength and then emits

A fluorescent substance absorbs EM radiation of one wavelength and then emits EM radiation of a different wavelength. Which wavelength is longer? Explain.

Q: Explain why every line in the absorption spectrum of hydrogen is present

Explain why every line in the absorption spectrum of hydrogen is present in the emission spectrum, but not every line in the emission spectrum is present in the absorption spectrum. [Hint: The excited...

Q: A parallel plate capacitor used in a flash for a camera must

A parallel plate capacitor used in a flash for a camera must be able to store 32 J of energy when connected to 300 V. (Most electronic flashes actually use a 1.5 to 6.0 V battery, but increase the eff...

Q: Explain the difference between speed and velocity.

Explain the difference between speed and velocity.

Q: According to Figure 30.3, higher energies correspond with times

According to Figure 30.3, higher energies correspond with times that are closer to the origin of the universe, so particle accelerators at higher energies probe conditions that existed shortly after t...

Q: You shoot a 51 g pebble straight up with a catapult whose

You shoot a 51 g pebble straight up with a catapult whose spring constant is 320 N/m. The catapult is initially stretched by 0.20 m. How high above the starting point does the pebble fly? Ignore air r...

Q: A solar cell is used to generate electricity when sunlight falls on

A solar cell is used to generate electricity when sunlight falls on it. How would you expect the current produced by a solar cell to depend on the intensity of the incident light? How would you expect...

Q: The photoresponse of the retina of the human eye at low light

The photoresponse of the retina of the human eye at low light levels depends on individual photosensitive molecules in rod cells being excited by the incident light. When excited, these molecules chan...