QUES: LEDs have been developed by Seoul Semiconductor that can operate on AC power without the need for a DC converter. For each half-cycle, part of the LED emits light and part is dark, and this is reversed during the next half-cycle. The efficacy of this type of HP-LED is typically 40 lm/W. A large number of LED elements in series may be able to operate directly from line voltage. In 2009, Seoul Semiconductor released a high DC voltage LED, named as 'Acrich MJT', capable of being driven from AC power with a simple controlling circuit. The low-power dissipation of these LEDs affords them more flexibility than the original AC LED design.
What did Seoul Semiconductor name their ac powered HP-LED?

ANS: Acrich MJT

QUES: The remaining band members recorded "Independent Women Part I", which appeared on the soundtrack to the 2000 film, Charlie's Angels. It became their best-charting single, topping the U.S. Billboard Hot 100 chart for eleven consecutive weeks. In early 2001, while Destiny's Child was completing their third album, Beyonce landed a major role in the MTV made-for-television film, Carmen: A Hip Hopera, starring alongside American actor Mekhi Phifer. Set in Philadelphia, the film is a modern interpretation of the 19th century opera Carmen by French composer Georges Bizet. When the third album Survivor was released in May 2001, Luckett and Roberson filed a lawsuit claiming that the songs were aimed at them. The album debuted at number one on the U.S. Billboard 200, with first-week sales of 663,000 copies sold. The album spawned other number-one hits, "Bootylicious" and the title track, "Survivor", the latter of which earned the group a Grammy Award for Best R&B Performance by a Duo or Group with Vocals. After releasing their holiday album 8 Days of Christmas in October 2001, the group announced a hiatus to further pursue solo careers.
What was the name of Destiny Child's third album?

ANS: Survivor

QUES: All of the highways into Wenchuan, and others throughout the province, were damaged, resulting in delayed arrival of the rescue troops. In Beichuan County, 80% of the buildings collapsed according to Xinhua News. In the city of Shifang, the collapse of two chemical plants led to leakage of some 80 tons of liquid ammonia, with hundreds of people reported buried. In the city of Dujiangyan, south-east of the epicenter, a whole school collapsed with 900 students buried and fewer than 60 survived. The Juyuan Middle School, where many teenagers were buried, was excavated by civilians and cranes. Dujiangyan is home of the Dujiangyan Irrigation System, an ancient water diversion project which is still in use and is a UNESCO World Heritage Site. The project's famous Fish Mouth was cracked but not severely damaged otherwise.
How many students out of the 900 in the school, survived the collapse?

ANS: 60

QUES: Equivalently, the smallness of the Planck constant reflects the fact that everyday objects and systems are made of a large number of particles. For example, green light with a wavelength of 555 nanometres (the approximate wavelength to which human eyes are most sensitive) has a frequency of 7014540000000000000♠️540 THz (7014540000000000000♠️5401012 Hz). Each photon has an energy E = hf = 6981358000000000000♠️3.581019 J. That is a very small amount of energy in terms of everyday experience, but everyday experience is not concerned with individual photons any more than with individual atoms or molecules. An amount of light compatible with everyday experience is the energy of one mole of photons; its energy can be computed by multiplying the photon energy by the Avogadro constant, NA 7023602200000000000♠️6.0221023 mol1. The result is that green light of wavelength 555 nm has an energy of 7005216000000000000♠️216 kJ/mol, a typical energy of everyday life.
What color of light is the human eye blind to?

ANS:
unanswerable