physics

Hassan Sayyad Khodaei

Hassan Sayyad Khodaei is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Hassan Sayyad Khodaei rather than just read about it. In short: Hassan Sayyad Khodaei (Persian: حسن صیاد خدایی, 1972 – May 22, 2022) was an Iranian military officer who served in the Islamic Revolutionary Guard Corps (IRGC). He was reportedly the deputy commander of Unit 840, a clandestine division tasked with orchestrating assassinations, kidnappings, and other covert activities targeting Iranian dissidents, Israeli interests, and Western figures across various regions, includi…

Key takeaways

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Reproduce the core statement of Hassan Sayyad Khodaei from memory before moving on to harder problems.

Reference excerpt

Hassan Sayyad Khodaei (Persian: حسن صیاد خدایی, 1972 – May 22, 2022) was an Iranian military officer who served in the Islamic Revolutionary Guard Corps (IRGC). He was reportedly the deputy commander of Unit 840, a clandestine division tasked with orchestrating assassinations, kidnappings, and other covert activities targeting Iranian dissidents, Israeli interests, and Western figures across various regions, including the Middle East, Europe, and Latin America. Serving as a Holy Shrine Defender, he was assassinated on 22 May 2022 by motorcycle-riding gunmen in front of his home. Iran has blamed the assassination on "global arrogance," a term used to refer to the United States and its allies, such as Israel. According to the Wall Street Journal, the New York Times and other sources citing people familiar with the matter, Khodaei planned kidnappings and killings for an arm of the IRGC known as Quds Force Unit 840, including failed plots to kill an Israeli diplomat, an American general and a French intellectual.

Background Hassan Sayyad Khodaei was born in 1972 in the Bashmaq, a village in Kolah Boz-e Gharbi Rural District, in the Central District of Mianeh County, East Azerbaijan Province. Sayyad Khodaei joined the Revolutionary Guard (IRGC) in 1987. Later, he was active as a Holy Shrine Defender (Persian: مدافعان حرم, romanized: Modāfe'ān-e-Haram). This phrase refers to those who fight against ISIS in Syria and Iraq as part of the Quds Force, responsible for extraterritorial operations. Iranian scientists and academics have been killed or attacked by explosions, bombs, or motorcycle-riding shooters since 2010. Israel has a history of assassinating nuclear scientists inside Iran in the same style. On 27 November 2020, the Israeli government, with knowledge and support from the US government assassinated a top nuclear scientist Mohsen Fakhrizadeh.

Assassination On the afternoon of 22 May 2022, Khodaei was returning home in the south of Tehran when he was fatally shot five times by motorcycle-riding gunmen in his car outside his home at around 4 pm (11:30 GMT). There has been no claim of responsibility for the assassination, but according to The Guardian the assassination style increases the chance of being linked to a series of previous motorcycle killings in Iran imputed to Israel, such as during the assassinations of Iranian nuclear scientists. In December 2023, former Israeli prime minister Naftali Bennett confirmed the Mossad executed him.

Reactions

On 23 May 2022, Ebrahim Raisi, president of Iran, promised to avenge the assassination. He described Khodaei as a martyr and blamed global arrogance for his assassination. Hossein Salami, the commander-in-chief of the IRGC, vowed a strong response and “revenge against the enemies” responsible. On 25 May 2022, Iran called on the international community to condemn such "cruel" assassinations that target other countries' innocent citizens. The New York Times reported that Israel had informed US officials about its role in assassination of a senior member of IRGC. Israel reportedly claimed the assassination was an attempt to warn Iran about the continuation of the operation of an alleged secret unit where Khodaei was a member. According to Ynet, Israel was outraged by the leak, and Israeli officials told Ynet that they were asking their American counterparts for a response since the New York Times report had blamed only Israel for the killings without mentioning the U.S. involvement. Israel claimed Khodaei was the deputy head of an alleged secret unit known as 840 in the Quds Force that carried out kidnappings and assassinations of figures outside Iran, mostly against Israelis. Israel referred to the confessions of an Iranian farmer named Mansour Rasouli who, according to Israel, confessed to plotting attacks against American and Israeli figures. Rasouli rejected any involvement in the operation. Later he said that he was kidnapped by Mossad and threatened to be killed along with his family and that he was forced to confess under torture. On June 3, Ali Esmailzadeh, another colonel of the Quds Force, died after falling from a roof in a supposed accident. An Iranian opposition source claimed he was killed by the IRGC over suspicions he leaked information that led to the assassination of Khodaei. On 30 April 2025, Mohsen Langarneshin, a 34-year old inmate of Ghezel Hesar prison in Karaj, was hanged over the murder and on charges of spying for Israel. Iranian authorities claimed that Langarneshin had been a Mossad agent since 2020 and had provided "technical support" to Khodaei's assassins. His family and human rights advocates disputed his role, saying that he had confessed under torture and did not receive a fair trial.

See also 2020 Iran explosions Assassination of Iranian nuclear scientists Assassination and terrorism in Iran Iran and weapons of mass destruction Iran–Israel proxy conflict Israel and state-sponsored terrorism Dariush Rezaeinejad Unit 840

References

Worked examples

Example 1 — a first encounter with Hassan Sayyad Khodaei

Start with the simplest possible case. Write down what Hassan Sayyad Khodaei claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Hassan Sayyad Khodaei before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Hassan Sayyad Khodaei ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Hassan Sayyad Khodaei

In research: Hassan Sayyad Khodaei appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Hassan Sayyad Khodaei in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Hassan Sayyad Khodaei is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1972 births, 2022 deaths, Assassinated Iranian people, so understanding it makes those chapters shorter.
In everyday life: Look for Hassan Sayyad Khodaei outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Hassan Sayyad Khodaei in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hassan Sayyad Khodaei means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Hassan Sayyad Khodaei out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hassan Sayyad Khodaei in simple terms?

Why does Hassan Sayyad Khodaei matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Hassan Sayyad Khodaei?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hassan Sayyad Khodaei.