A laser pointer used in the classroom emits light at 4950 Å, at a power of 4.00 mW. (One watt is the SI unit of power, the measure of energy per unit of time. 1 W = 1 J/s). How many photons are emitted from the pointer in 115 seconds?

A certain shade of blue has a frequency of 7.32×10^14 Hz. What is the energy of exactly one photon of this light? Planck's constant is ℎ=6.626×10^−34 J⋅s.

An argon ion laser puts out 6.0 W of continuous power at a wavelength of 532 nm. The diameter of the laser beam is 5.0 mm . If the laser is pointed toward a pinhole with a diameter of 1.0 mm , how many photons will travel through the pinhole per second? Assume that the light intensity is equally distributed throughout the entire cross-sectional area of the beam. (1 W = 1 J/s)

1a) What is the wavelength of a photon of light (in nm) whose frequency is 3.74 x 10^14 Hz? 1b)Consider a photon with wavelength 552 nm. What is the energy of a mole of photons of this wavelength (in kJ)?

Consider light with a wavelength of 5.41 × 10⁻¹⁰ m. The energy of a single photon of this type of light is 3.67 × 10⁻¹⁶ J, and it takes 7.44 × 10⁴ J to heat a cup of water. How many photons would be required to heat 1.00 cup (237 g) of water?

A photon of blue light has a frequency of 7.40 × 10¹⁴ Hz. Calculate the wavelength of this photon (c = 3.00 × 10⁸ m/s) in nanometers.

Visible light falls into wavelength ranges of 400-700 nm, for which 1 m = 1 x 10° nm. The energy and wavelength of light are related by the equation hc E where E is energy in Joules, h is Planck's constant (6.626 × 10 34 J-s), c is the speed of light ( 2.998 x 10 m/s), and X is the wavelength in m. If a visible light photon has a wavelength of 407.6 nm, what is the energy of the photon (in J)?

What would be the wavelength, in nanometers (nm), of electromagnetic radiation with a frequency of 1.333 x 1014 Hz?  Assume the speed of light is 3.000 x 108 meters/second.

Microwave ovens use microwave radiation to heat food. The energy of the microves is absorbed by water molecules in the food and then transferred to the rest of the food. Suppose the microwave radiation has a wavelength of 11.2 cm. How many photons are required to heat 2.00  102 mL of coffee from 23 to 60 oC? If the power of the microwave is 9.00  102 W (1 Watt = 1 Joule/second), how long would you have to heat the coffee?

The scattering of sunlight by the mixture of gas molecules in air results in the blue color of the sky. Calculate the energy (in Joules) of a single photon of blue light with a frequency of 6.20 × 10¹⁴ Hz. (h = 6.626 × 10⁻³⁴ J • s)