Following a lecture on transverse and longitudinal waves, four students make Venn diagrams to characterize these waves.

Question Following a lecture on transverse and longitudinal waves, four students make Venn diagrams to characterize these waves. Which Venn diagram is correct? Answer B Explanation: Waves are periodic oscillations created by a disturbance, that travel carrying energy but not matter. There exist two types of waves: – Transverse waves: the direction of the oscillations … Read more

A car traveling with constant speed travels 150 km in 7200 seconds. What is the speed of the car?

Question A car traveling with constant speed travels 150 km in 7200 s. what is the speed of the car Answer 1 (Expert Verified) Speed =   150 km = 150 000 m Speed =   Speed = 20.83 m/s, or 75.0 km/h Answer 2 So 150 km — 7200s7200 s is equal to 120 minutes (7200/60) 120 minutes = 2 hours (120/60) 150 km in 2 hours, we need to know how … Read more

Since v = λ f, the speed v of a wave depends on its frequency f.

Question Since v = λ f, the speed v of a wave depends on its frequency f. True or False?  Answer It’s ++FALSE++, the reason is: speed of the wave depends on the properties of the medium. Example: for a mechanical wave, speed of wave depend on elastic and inertial properties of the medium for … Read more

The length of a 60 W, 240 Ω light bulb filament is 60 cm

Question The length of a 60 W, 240 Ω light bulb filament is 60 cm. Remembering that the current in the filament is proportional to the electric field, what is the current in the filament following the doubling of its length? Answer Answer: Finally current will be i = 0.35 A Explanation: As we know … Read more

A 0.50-mm-wide slit is illuminated by light of wavelength 500 nm.

Question A 0.50-mm-wide slit is illuminated by light of wavelength 500 nm. What is the width of the central maximum on a screen 2.0 m behind the slit? Answer Answer: Explanation: A single slit of width x has bright central maximum of width: ω=(2λL)/x Given data x=0.50 mm λ(wavelength)=500 nm L(length)=2.0 m Substitute the given … Read more