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1) In converting electrical energy into light energy, asixty-watt incandescent light bulb operates at about 2.2% efficiency. Assuming that all of the light is greenlight (wavelength approximately 5500 Å), determine the number of photons per second given offby the bulb.2) Continuing with the example in question 1 – if you were tolook directly at the bulb, the light from it would travel directly to your eye without reflecting fromanything. If you stand 3.5 meters away and look at the bulb for only 0.10 seconds, how manyphotons will enter your eye? (assume the pupil of your eye has a diameter of 2.1 mm) So is it a good idea to look directly at the bulb (or even througha filter) when it’s on?3) You are given a silver surface and you know that the workfunction (W0 or Φ) for silver is 4.73 eV. Find the minimum frequency (cutoff frequency f0) that lightmust have to eject electrons from this surface.
What is the maximum wavelength that will cause electrons to beejected?
A 10 cm long thin glass rod is uniformly charged to +50 nC. A small plastic bead, charged to - 4.8 nC, is 4.2 cm from the center of the rod. What is the magnitude of the force of the bead.
Two masses are tied to a rope. The first mass is attached to a spring that is then attached to the ground. How much potential energy is stored in the spring
A molecule is shown schematically. The distance from the center of the larger atom to the center of the smaller atom is d = 0.96, and the angle between the smaller atoms is θ = 105.6°. Find out the center-to-center distance between the smaller ato..
A worker on the roof of a house drops his 0.55 kg hammer, which slides down the roof at constant speed of 4.93m/s. What is the horizontal distance traveled by the hammer from the time it leaves the roof to the time it hits the ground
A cylinder (I = MR^2/2) is rolling along the ground at 7m/s. It comes to a hill and starts going up. Assume no losses to friction, how high does it get before it stops.
A guitar string is 60 cmlong. The string has a mass of 1.8g and is under a tensionof 945N. Calculate the fundamental wavelength for this string
A long straight wire suspended in the air carries a current of 8.2 A in the -x direction. The wire runs along the x-axis such that it goes through the origin. find the magnitude of the magnetic force on the electron
find how much energy is needed to remove one of the neutrons from a 3h atom to yield a 2h atom plus a neutron.the rest
To measure the speed of a bullet, the following situation is setup. A wooden block(m=0.50kg) is put on top of a fencepostwith a height of 1.5m. The bullet (m=.010kg) strikes theblock from a perfectly horizontal direction and remains embedded init. Th..
To test the quality of a tennis ball, you drop it onto the floor from a height of 4.00 m. What is the magnitude of its average acceleration during the contact with the floor
What direction is white dot on the sensor pointing
A 25 g glass tumbler contains 340 mL of water at 24°C. If four 20 g ice cubes each at a temperature of -3°C are dropped into the tumbler, what is the final temperature of the drink
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